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{{Infobox software
| name                   = OpenSocial
| logo                   =  [[File:NonFreeImageRemoved.svg|200px]]
| screenshot             =
| caption                =
| developer              = [http://www.w3.org/Social/WG W3C Social Web Working Group]
| status                 = Active
| released               = {{start date|2007|11|}}
| latest release version = 2.5.1
| latest release date    = {{Release date|mf=yes|2013|08|30}}
| latest specification   = [https://opensocial.atlassian.net/wiki/display/OSD/Specs]
| operating system       = [[Cross-platform]]
| reference implementation = [http://shindig.apache.org/ Apache Shindig]
| programming language   = Java, PHP, C#, Javascript, HTML
| genre                  = [[Web application framework]]
| license                = [[Apache License 2.0]]
| website                = {{URL|http://www.opensocial.org}}
}}

'''OpenSocial''' is a public specification that defines a component hosting environment (container) and a set of common [[application programming interface]]s (APIs) for [[World Wide Web|web]]-based applications. Initially, it was designed for [[Social network service|social network applications]] and developed by [[Google]] along with [[MySpace]] and a number of other social networks, including social networking sites (SNS). In more recent times, it has become a dopted as a general use [[runtime environment]] for allowing untrusted and partially trusted components from third parties to run in an existing web application. The OpenSocial Foundation moved to integrate or support numerous other [[Open Web|open web]] technologies. This includes [[Oauth|OAuth]] and OAuth 2.0, [[Activity Streams (format)|Activity Streams]], and [[Portable Contacts]], among others.

It was released on November 1, 2007.<ref>{{Cite web|title = Google Launches OpenSocial to Spread Social Applications Across the Web – News announcements – News from Google – Google|url = http://googlepress.blogspot.com/2007/11/google-launches-opensocial-to-spread_01.html|website = googlepress.blogspot.com|accessdate = 2015-11-23}}</ref> 
Applications implementing the OpenSocial APIs are [[interoperability|interoperable]] with any social network system that supports them. At launch, OpenSocial took a one-size-fits-all approach to development. As it became more robust and the user-base expanded, OpenSocial modularized the platform to allow developers to only include the parts of the platform it needed.<ref name="OS100" />

On 16 December 2014 the [[W3C]] issued a press release, "OpenSocial Foundation Moving Standards Work to W3C Social Web Activity",<ref name="press release-move">{{cite web |url=http://www.w3.org/2014/12/opensocial.html.en|title=OpenSocial Foundation Moving Standards Work to W3C Social Web Activity |access-date=2014-12-17 |date=2014-12-16 |publisher=[[W3C]] }}</ref> that OpenSocial would no longer exist as a separate entity and encouraged the OpenSocial community to continue development work through the [http://www.w3.org/Social/ W3C Social Web Activity] in the [http://www.w3.org/Social/WG Social Web Working Group] and [http://www.w3.org/Social/IG Social Interest Group]. The OpenSocial Foundation stated that "the community will have a better chance of realizing an open social web through discussions at a single organization, and the OpenSocial Foundation board believes that working as an integrated part of W3C will help reach more communities that will benefit from open social standards."<ref name="newHomepage">{{cite web |url=https://www.w3.org/blog/2014/12/opensocial-foundation-moves-standards-work-to-w3c-social-web-activity/ |title=OpenSocial Foundation Moves Standards Work to W3C Social Web Activity W3C Blog |access-date=2015-12-01 |date=2014-12-16 |publisher=[[W3C]] }}</ref> On 1 January 2015, [http://www.opensocial.org opensocial.org] began redirecting all page requests to https://www.w3.org/blog/2014/12/opensocial-foundation-moves-standards-work-to-w3c-social-web-activity/.<ref name="newHomepage" />

==Structure==
[[File:Opensocial.jpg|thumb|Structure of OpenSocial<ref>{{Cite journal|title = Opensocial: An Enabler for Social Applications on the Web|url = http://doi.acm.org/10.1145/1866739.1866765|journal = Commun. ACM|date = 2011-01-01|issn = 0001-0782|pages = 139–144|volume = 54|issue = 1|doi = 10.1145/1866739.1866765|first = Matthias|last = Häsel}}</ref>|400x400px]]
Based on [[HTML]] and [[JavaScript]], as well as the [[Google Gadgets]] framework, OpenSocial includes multiple APIs for [[social software]] applications to access data and core functions on participating [[social network]]s.<ref>{{Cite web|title = Open Social: a new universe of social applications all over the web|url = https://web.archive.org/web/20071102041108/http://blog.pmarca.com/2007/10/open-social-a-n.html|date = 2007-11-02|accessdate = 2015-11-25}}</ref> Each API addresses a different aspect.<ref>{{Cite web|title = OpenSocial Foundation|url = https://github.com/opensocial|website = GitHub|accessdate = 2015-11-25}}</ref> It also includes APIs for contacting arbitrary third party services on the web using a [[Proxy server|proxy]] system and OAuth for security.

In version 0.9 OpenSocial added support for a [[Markup language|tag-based language]].<ref name=":0" />  This language is referred to as OSML and allows tag-based access to data from the OpenSocial APIs that previously required an asynchronous client-side request. It also defined a rich tag template system and adopted an expression language loosely based on the [[Java (programming language)|Java]] [[Expression Language]].

Starting in version 2.0, OpenSocial adopted support for [[Activity Streams (format)|Activity Streams]] format.<ref name=":0">{{Cite web|title = OpenSocial   Specification Release Notes|url = http://opensocial-resources.googlecode.com/svn/spec/2.0/OpenSocial-Specification-Release-Notes.xml#rfc.section.4|website = opensocial-resources.googlecode.com|accessdate = 2015-11-23}}</ref>

==History==

===Development===
OpenSocial was rumored to be part of a larger social networking initiative by Google code-named "Maka-Maka",<ref name="Makamaka">{{cite web |url=http://www.techcrunch.com/2007/10/29/googles-response-to-facebook-maka-maka/ |title=Google’s Response to Facebook: "Maka-Maka" |accessdate=2007-10-31 |last=Schonfeld |first=Erick |date=2007-10-29 |work=[[TechCrunch]] |publisher= |doi= |archiveurl= |archivedate= |quote= }}</ref> which is defined as meaning "intimate friend with whom one is on terms of receiving and giving freely" in [[Hawaiian language|Hawaiian]].<ref name="makamaka meaning">{{cite web |url=http://www.wehewehe.org/gsdl2.5/cgi-bin/hdict?d=D12283 |title=maka.maka |accessdate=2007-11-01 |author= |date= |work=Nā Puke Wehewehe ʻŌlelo Hawaiʻi |publisher=Ulukau: The Hawaiian Electronic Library |pages= |language= |doi= |archiveurl= |archivedate= |quote= }}</ref>

===Implementation===
An [[open source]] project, [[Shindig (software)|Shindig]], was launched in December 2007, to provide a [[reference implementation]] of the OpenSocial standards. It has the support of Google, Ning, and other companies developing OpenSocial-related software.  The Myspace OpenSocial parser was released as project Negroni in January 2011 and provides a [[C Sharp (programming language)|C#]] based implementation of OpenSocial.

Apache Rave is a lightweight and open-standards based extensible platform for using, integrating and hosting OpenSocial and W3C Widget related features, technologies and services. It will also provide strong context-aware personalization, collaboration and content integration capabilities and a high quality out-of-the-box installation as well as be easy to integrate in other platforms and solutions.<ref>{{cite web|url=https://www.w3.org/blog/2014/12/opensocial-foundation-moves-standards-work-to-w3c-social-web-activity/#Container_Information |title=Open Social  Foundation Moves Standards Work to W3C Social Web Activity | date= |accessdate=2015-12-2}}</ref>

===Background===
OpenSocial is commonly described as a more open [[cross-platform]] alternative to the [[Facebook Platform]], a proprietary service of the popular [[social network service]] [[Facebook]].<ref name="NY Times">{{cite news |url=http://www.nytimes.com/2007/10/31/technology/31google.html |title=Google and Friends to Gang Up on Facebook |accessdate=2007-10-31 |author= |last=Helft |first=Miguel |authorlink= |author2=Brad Stone |date=2007-10-31 |work=[[The New York Times]] |publisher=[[The New York Times Company]] |pages= |language= |doi= |archiveurl= |archivedate= |quote= }}</ref> 

While OpenSocial has seen a decline in popularity among social networks, it is seeing wider adoption in enterprise companies in recent years as a pluggable extension mechanism for web products. Several of the leading vendors in enterprise social networks, [[IBM]], [[eXo Platform]] and [[Jive Software]], based their apps strategy on OpenSocial. [[Cisco Systems|Cisco]] is essentially betting the farm on it, making their Shindig-based container, Finesse, the only option for agent desktop integration software.<ref>{{cite web|author=Worldwide |url=http://www.cisco.com/c/en/us/products/customer-collaboration/finesse/index.html |title=Finesse - Products & Services |publisher=Cisco |date= |accessdate=2014-07-12}}</ref>

== Usage ==
Enterprise websites, such as [[Friendster]], [[hi5]], [[LinkedIn]], [[Myspace|MySpace]], [[Orkut]], and [[Salesforce.com]] are major users of OpenSocial.<ref>{{Cite web|title = What is OpenSocial? A Webopedia Definition|url = http://www.webopedia.com/TERM/O/OpenSocial.html|website = www.webopedia.com|accessdate = 2015-11-23}}</ref>

===Friendster===
[[ Friendster ]] has deployed APIs from version 0.7 of the OpenSocial specification, making it easy for existing OpenSocial applications using version 0.7 to be launched on Friendster and reach Friendster's over 75 million users. Friendster also plans to support additional OpenSocial APIs in the coming months, including the new 0.8 APIs.<ref>{{Cite web|title = Friendster Opens Platform to Developers|url = http://www.pcworld.com/article/138956/article.html|website = PCWorld|accessdate = 2015-12-02}}</ref>

=== hi5 ===
[[ hi5 ]] taps [[Widgetbox]]'s support for OpenSocial to get access to the unsurpassed choice of web widgets Widgetbox provides.<ref>{{Cite web|title = "hi5 Taps Widgetbox for OpenSocial Support and Access to the World's Widest Selection of Widgets." Science Letter 9 Sept. 2008: 4265. Academic OneFile. Web.|url = http://go.galegroup.com/ps/i.do?id=GALE%257CA185000528&v=2.1&u=upitt_main&it=r&p=&sw=w&asid=12ff4338141eb7d8148c8a27147041a0|website = go.galegroup.com|accessdate = September 9, 2015}}</ref>

=== MySpace ===
[[ Myspace ]] Developer Platform (MDP) is based on the OpenSocial API. It supports social networks to develop social and interacting widgets. It can be seen as an answer to Facebook's developer platform.<ref>{{Cite web|url = http://developer.myspace.com/Community/blogs/devteam/archive/2008/02/05/let-me-see-my-app.aspx|title = Let me see my app!|date = February 5, 2008|accessdate = February 5, 2008|website = |publisher = |last = |first = }}</ref>

==Advantages==
Compared to proprietary social platform like [[ Facebook Platform ]], open social has 2 advantages.
* With the Facebook platform, only Facebook itself can be a "container" -- "apps" can only run within Facebook itself. In contrast, with Open Social, any social network can be an Open Social container and allow Open Social apps to run within it.
* With the Facebook platform, app developers build to Facebook-proprietary languages and APIs such as FBML (Facebook Markup Language) and FQL ([[ Facebook Query Language ]]) -- those languages and APIs don't work anywhere other than Facebook -- and then the apps can only run within Facebook. In contrast, with Open Social, app developers can build to standard HTML and Javascript, and their apps can then run in any Open Social container.<ref>{{Cite web|title =Open Social: a new universe of social applications all over the web | url = https://web.archive.org/web/20071108001311/http://blog.pmarca.com/2007/10/open-social-a-n.html|accessdate = 2015-12-02}}</ref>

== Security Issues ==
Initial OpenSocial support experienced vulnerabilities in security, with a self-described amateur developer demonstrating [[exploit (computer security)|exploits]] of the [[RockYou]] gadget on [[Plaxo]], and of [[Ning (website)|Ning]] social networks using the [[iLike]] gadget.<ref name="theharmonyguy">{{cite web |url=http://www.techcrunch.com/2007/11/05/opensocial-hacked-again |title=OpenSocial Hacked Again |accessdate=2007-11-06 |last=Arrington |first=Michael |authorlink=Michael Arrington |date=2007-11-05 |work= |publisher=[[TechCrunch]] |doi= |archiveurl= |archivedate= |quote= }}</ref> As reported by [[TechCrunch]] on 5 November 2007, OpenSocial was quickly cracked. The total time to crack the OpenSocial-based iLike on Ning was just 20 minutes, with the attacker being able to add and remove songs on a user's playlist and access the user's friend information.<ref>{{cite web |url=http://techcrunch.com/2007/11/05/opensocial-hacked-again/ |title=OpenSocial Hacked Again |accessdate=2010-07-24 |last=Arrington |first=Michael |date=2007-11-05 |work=[[TechCrunch]] |publisher= |doi= |archiveurl= |archivedate= |quote= }}</ref>

Hasel and Iacono showed that “OpenSocial specification were far from being comprehensive in respect to security”.<ref>{{Cite book|title = Security in OpenSocial-Instrumented Social Networking Services|url = http://link.springer.com/chapter/10.1007/978-3-642-13241-4_5|publisher = Springer Berlin Heidelberg|date = 2010-05-31|isbn = 978-3-642-13240-7|pages = 40-52|series = Lecture Notes in Computer Science|doi = 10.1007/978-3-642-13241-4_5|language = en|first = Matthias|last = Häsel|first2 = Luigi Lo|last2 = Iacono|editor-first = Bart De|editor-last = Decker|editor-first2 = Ingrid|editor-last2 = Schaumüller-Bichl}}</ref> They discussed different security implications in the context of OpenSocial. They introduced possible vulnerabilities in Message Integrity and Authentication, Message Confidentiality, and Identity Management and Access Control.
==Release Versions==

===Criticism of Initial Release===

Opened to much fanfare in news coverage, OpenSocial did not work well in the beginning; it only ran on Google-owned [[Orkut]], and only with a limited number of gadgets, returning errors for other gadgets. Other networks were still looking into implementing the framework.

On December 6, TechCrunch followed up with a report by MediaPops founder Russ Whitman, who said "While we were initially very excited, we have learned the hard way just how limited the release truly is." Russ added that "core functionality components" are missing and that "write once, distribute broadly" was not accurate.<ref>{{cite web |url=http://techcrunch.com/2007/12/06/opensocial-still-not-open-for-business/ |title=OpenSocial Still "Not Open for Business" |accessdate=2010-07-24 |last=Schonfeld |first=Erick |date=2007-12-06 |work=[[TechCrunch]] |publisher= |doi= |archiveurl= |archivedate= |quote= }}</ref>


'''Legend: '''
{{legend inline|#ffdead|{{abbr|Discontinued|Discontinued versions are not the latest version.}}|border=none}}
{{legend inline|#3d4|{{abbr|Current|The current version is the latest public version.}}|border=none}}

{| class="wikitable"
|-
!style="width:150px"|Version
!style="width:200px"|{{nowrap|Release Date}}
!style="width:200px"|Release Notes
|-
|style="background:#3d4;"|'''2.5.1<ref name="OS251">{{cite web| title = OpenSocial Specification 2.5.1 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#OpenSocial251}}</ref>'''
|{{Start date |2013|08|30}}
|[[#Version 2.5.1|View Release Notes]]
|-
|style="background:#ffdead;"|'''2.5.0<ref name="OS250">{{cite web| title = OpenSocial Specification 2.5.0 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#OpenSocial250}}</ref>'''
|{{Start date |2012|08|28}}
|[[#Version 2.5.0|View Release Notes]]
|-
|style="background:#ffdead;"|'''2.0.1<ref name="OS201">{{cite web| title = OpenSocial Specification 2.0.1 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#OpenSocial201}}</ref>'''
|{{Start date |2011|11|23}} 
|[[#Version 2.0.1|View Release Notes]]
|-
|style="background:#ffdead;"|'''2.0.0<ref name="OS200">{{cite web| title = OpenSocial Specification 2.0.0 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#OpenSocial20}}</ref>'''
|{{Start date |2011|08|18}}
|[[#Version 2.0.0|View Release Notes]]
|-
| style="background:#ffdead;"|'''1.1.0<ref name="OS110">{{cite web| title = OpenSocial Specification 1.1.0 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#rfc.section.5}}</ref>'''
|{{Start date |2010|11|18}}
|[[#Version 1.0.0|View Release Notes]]
|-
| style="background:#ffdead;"|'''1.0.0<ref name="OS100">{{cite web| title = OpenSocial Specification 1.0.0 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#rfc.section.6}}</ref>'''
|{{Start date |2010|03|09}}
|[[#Version 1.0.0|View Release Notes]]
|-
| style="background:#ffdead;"|'''0.9.0<ref name="OS090">{{cite web| title = OpenSocial Specification 0.9.0 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#rfc.section.7}}</ref>'''
|{{Start date |2009|04|15}}
|[[#Version 0.9.0|View Release Notes]]
|-
|style="background:#ffdead;"|'''0.8.1<ref name="OS081">{{cite web| title = OpenSocial Specification 1.8.1 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#rfc.section.8}}</ref>'''
|{{Start date |2008|09|25}} 
|[[#Version 0.8.1|View Release Notes]]
|-
|style="background:#ffdead;"|'''0.8.0<ref name="OS080">{{cite web| title = OpenSocial Specification 0.8.0 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#rfc.section.9}}</ref>'''
|{{Start date |2008|05|27}} 
|[[#Version 0.8.0|View Release Notes]]
|-
|style="background:#ffdead;"|'''0.7.0<ref name="OS070">{{cite web| title = OpenSocial Specification 0.7.0 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#rfc.section.10}}</ref>'''
|{{Start date |2008|01|25}} 
|[[#Version 0.7.0|View Release Notes]]
|-
|style="background:#ffdead;"|'''0.6.0<ref name="OS060">{{cite web| title = OpenSocial Specification 0.6.0 Release Notes | publisher=[[GitHub]] | author=Mark Marum | date=2013-01-01 | accessdate = 2015-11-28 | url = http://opensocial.github.io/spec/2.5.1/OpenSocial-Specification-Release-Notes.xml#rfc.section.11}}</ref>'''
|{{Start date |2007|12|21}} 
|[[#Version 0.6.0|View Release Notes]]
|-
|style="background:#ffdead;"|'''0.5.0<ref name="OS050">{{cite web| title = OpenSocial Container Pre-Release | publisher = [[Mashable]] | author=Mark Hopkins | date=2007-11-09 | accessdate = 2015-11-28 | url = http://mashable.com/2007/11/09/opensocial-container-pre-released/#M5YlO7xPUaqZ}}</ref>'''
|{{Start date |2007|11|09}} 
|[[#Version 0.5.0|View Release Notes]]
|}

===Version 2.5.1===
Changes to the REST API were made to address several issues that required changes in the OpenSocial specifications so it could be used by the [[Open Mobile Alliance]].<ref name="OS251" />

===Version 2.5.0===
Common Containers were added that provided "a set of common services that Container developers can leverage for features like in-browser Gadget lifecycle event callbacks, Embedded Experiences, selection handlers, and action handlers."<ref name="OS250" />  A new Metadata API gives OpenSocial applications the ability to adapt to the capabilities of different OpenSocial containers. The [[WAP]] authentication extension was deprecated.

===Version 2.0.1===
OAuth 2.0 support was finalized in this version of OpenSocial.<ref name="OS201" />

===Version 2.0.0===
OpenSocial introduced support for [[Activity Streams]]. JSON had emerged as the preferred data format and support for [[ATOM]] was deprecated. The Gadget format was simplified to give the ability to define a template library within a Gadget specification.<ref name="OS200" /> While not finalized, the groundwork for OAuth 2.0 support was put in place.

===Version 1.1.0===
In response to enterprise environment needs, OpenSocial added support for advanced mashup scenarios. It enabled gadgets to "securely message each other in a loosely coupled manner."<ref name="OS110" /> This new feature was called Inter-Gadget Communication.

===Version 1.0.0===
OpenSocial acknowledged that the "one-size-fits-all" approach it was taking was not going to work for the diverse type of websites that had adopted the platform. To address this issue, OpenSocial modularized into four compliance modules: Core API Server, Core Gadget Server, Social API Server, and Social Gadget Server.<ref name="OS100" /> This allowed a developer to pick and choose the modules they wanted to use while using other services that aren't part of OpenSocial. Extensions were introduced to allow developers to extend OpenSocial containers.

===Version 0.9.0===
In response to feedback and observation of how developers were using the API, this version focused on making "application development, testing, and deployment easier and faster, while reducing the learning curve for new app developers."<ref name="OS090" /> The OpenSocial Javascript API was streamlined to make it lightweight while retaining the power of the old Javascript API. Proxied content was introduced to eliminate the need for developers to work around previous AJAX limitations. Proxied content allows a content to be fetched from a URL and displayed in a <Content> tag. In response to a common use of sending data to a remote server immediately after a request, OpenSocial 0.9.0 introduced data pipelining. Data pipelining allows the developer to specify the social data the application will need and make the data immediately available. OpenSocial Templates were introduced to create data-driven UI with a separation of markup and programmatic logic. OpenSocial Markup Language (OSML Markup) is a new set of standardized tags to accomplish common tasks or safely perform normally unsafe operations within templates. OSML is extensible. Developers can create a library of their own custom tags.

===Version 0.8.1===
This minor release placed a major focus on server-to-server protocols as "the Person schema has been aligned with the Portable Contacts effort, and an optional RPC proposal has been added."<ref name="OS081" /> [[JSON-RPC]] protocol was added to increase server to server functionality. The RESTful protocol that was introduced in v0.8.0 underwent a large revision with several fields being added, modified, and deleted.

===Version 0.8.0===
OpenSocial changed specifications for containers to implement a [[RESTful API]]. Many of the OpenSocial Javascript API changes made this version incompatible with previous versions. Existing gadgets continued to use v0.7.0. After updating the gadget, it would use v0.8.0. Security improved with the introduction of OAuth authorization and HTML sanitation, and container lifecycle events.<ref name="OS080" /> Persistence data was stored in [[JSON]].

===Version 0.7.0===
Released as the "first iteration that can fully support rich, social applications."<ref name="OS070" /> It added several standard fields for profile information, the ability to send a message to install an application, an Activity template to control activity notifications about what users have been doing, and a simplified persistence API to use feeds instead of global and instance-scoped application data. Another major announcement came from [[Apache Shindig]]. Apache Shindig made gadgets open sourced. In coordination with this announcement, OpenSocial 0.7.0 introduced Gadget Specifications for developers to be able to define their gadgets using the Gadget API.

===Version 0.6.0===
Security was a large focus in version 0.6.0. Permission controls were tightened to prevent a gadget from returning information if it is not authorized to do so. New classes were added, such as the Environment class to allow a gadget to respond differently according to its environment and the Surface class to support navigation from one surface to another.  The Activities class was simplified based on developer needs and the Stream class was deprecated.<ref name="OS060" />

===Version 0.5.0===
Google announced the launch of OpenSocial with a pre-release of version 0.5.0. While unstable, this API introduced "various XML DTDs, Javascript interfaces and other data structures"<ref name="OS050" /> to the OpenSocial platform.

==References==
{{reflist|2}}

==External links==
*[http://shindig.apache.org/ Shindig] Shindig is an open source implementation of the OpenSocial specification and gadgets specification.

{{Google Inc.}}
{{Online social networking}}

{{DEFAULTSORT:Opensocial}}
[[:Category:Application programming interfaces]]
[[:Category:Google]]
[[:Category:Social networking services]]