Open Social is an open web API that can be supported by two kinds of developers:

• "Containers" -- social networking systems like Ning, Orkut, LinkedIn, Hi5, and Friendster, and...
• "Apps" -- applications that want to be embedded within containers -- for example, the kinds of applications built by iLike, Flixster, Rockyou, and Slide.

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• 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.

Technically, Open Social is implemented as what I call a "plug-in API", or a "Level 2 platform". In other words, it's not a web services API -- rather, it's a way for external applications to "plug into" a host environment (or "container"). And then, in addition to literally showing up inside the pages of a container, the external app can make Javascript calls to retrieve all kinds of useful information from the container and perform all kinds of useful functions within the container, such as "give me a list of all of this user's friends" or "inject this event into this user's activity feed".

Open Social is very practical. Many standards die an early death because they are too complicated and hard to implement. Open Social is what you want in a standard -- it's expansive enough to do useful things, but limited enough to be very easy to implement, both for containers and for apps.

Is this good for the web?

This is very, very good for the web. Open Social is the kind of standard that web developers love, and can easily use. I think it will become a standard part of many developers' toolkits. It builds on HTML and Javascript, many people can support it, and it will be interoperable -- I know that because it already is interoperable for the partners in this week's launch. It's all good.

Where's MySpace?

Beats me.

Where's Yahoo?

Beats me.

Labels: Flixster, Friendster, google, Hi5, iLike, LinkedIn, ning, orkut, Rockyou, Slide, social networks