Turntable.fm is one of the many social streaming music sites out there -- it allows you and your friends to stream music and even listen in together to your favorite albums and songs. The company already has its own standalone app for the App Store, but it's trying a new tactic now to grab attention in this increasingly crowded streaming market, releasing a new app called Piki (a misspelling of "picky," I guess) that's centered not just around listening to music, but around sharing recommendations and favorites.
Just like any other streaming app out there (Pandora, Slacker, and Rdio are all popular variants on this),
