Facebook released a Software Development Kit for android for which iPhone will have to wait for some more time.
Facebook SDK make things easier for developers as they can integrate their applications for Facebook with a few code additions.
Source:
http://www.wiseandroid.com/post/2010/05/30/Facebook-SDK-for-Android-released.aspx
I know what you may be thinking: Twitter location API already supports places; thats why they call it the location API, right? Well, yes and no.
Currently, it supports latitude and longitude, which tells the world where, exactly, you were located when you tweeted.
Source:
http://mashable.com/2010/03/02/twitter-location-api-places/
