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Go to the Google Play store to install the app. You can install it one time only, or make it a more permanent fixture.
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.