No, Google+ is not open source. Google provides a number of APIs that provide developers with access to a subset of Google+ features and there are "client libraries" (libraries written in a variety of programming languages) for using these APIs. Many of the client libraries are open source. Google+, itself, is not open source however. As to your question about Closure, you should keep in mind that Google+ consists of both the user interface that you see in your browser as well as server-side code that processes and stores this data... moreover, there is more to the UI than just JavaScript (e.g. CSS and HTML), so even if all of the JavaScript in the UI used Closure... there would still be plenty of other stuff.
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您可以查看以下链接。在那里你可以找到很多关于谷歌产品以及开源包和程序的信息。
You can Check The following link. There you can find a lot about google products and open source packages and programs.
不，Google+ 不是开源的。 Google 提供了许多 API，使开发人员可以访问 Google+ 功能的子集，并且有“客户端库”（以各种编程语言编写的库）用于使用这些 API。许多客户端库都是开源的。然而，Google+ 本身并不是开源的。至于您关于 Closure 的问题，您应该记住，Google+ 由您在浏览器中看到的用户界面以及处理和存储此数据的服务器端代码组成......此外，UI 还有更多内容不仅仅是 JavaScript（例如 CSS 和 HTML），所以即使 UI 中的所有 JavaScript 都使用 Closure...仍然会有很多其他东西。
No, Google+ is not open source. Google provides a number of APIs that provide developers with access to a subset of Google+ features and there are "client libraries" (libraries written in a variety of programming languages) for using these APIs. Many of the client libraries are open source. Google+, itself, is not open source however. As to your question about Closure, you should keep in mind that Google+ consists of both the user interface that you see in your browser as well as server-side code that processes and stores this data... moreover, there is more to the UI than just JavaScript (e.g. CSS and HTML), so even if all of the JavaScript in the UI used Closure... there would still be plenty of other stuff.