The new Facebook Home app is only available on Android. Facebook wants to bring a similar experience to the iPhone.
The controversial Facebook Home app is also coming to the iPhone in some form if Facebook has its way. Bloomberg is reporting that Apple and Facebook discuss a Facebook Home version for the iPhone. The implementation could look very different as Facebook lets Apple to influence the experience.
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I am pretty sure Apple will not allow Facebook to take over too much of the iPhone experience. It will be some sort of app with maybe some more notification integrations.