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HTC One, One X, and X+ along with the Galaxy S3, S4, and Galaxy Note 2 will be among the first phones to support. The idea is to start off slow. It will be available for download on April 12.
The "Facebook home program" is a set of guidelines to make it as easy as possible for phone makers.
Zuckerberg says people spend 3 times more time with Facebook than with any other app. Note that Google+ is not on the list.