Facebook has just announced that applications on Facebook Platform can now be able to take advantage of the site’s built-in chat functionality, which launched last spring. Developers will now be able to present users with a list of their Facebook Chat buddies, tailoring the list to best suit their application (for example, they can choose to only present friends that already have the app installed).

Facebook users have been able to use Chat and their Facebook apps simultaneously since Chat launched (one of its biggest selling points is that it remains open at the bottom of the screen, no matter where on the site you go). But until now applications didn’t really have a way to tap... 

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