interact and like friendfeed google reader and pownce (r.i.p.)

needs more services that have 'friends' and ways to interact with them via social thing i don't really need to see JUST my own activity from a service. also the fbook and twitter options are good but the way to get more user to stick with ST is if the less popular services have robust feature not found with an air app or other app. thanx
and pownce and magnolia are dead
but friendfeed, google reader and pownce are the design archetypes to follow!