We’ve seen startups try to turn Facebook and Twitter streams into music playlists before. Now Serendip is entering the fray, emerging from private beta with the slogan ‘Social music radio, created by you and your friends’. Or, more accurately, by you and the people you’re following on Twitter and friends with on Facebook, who may or may not share your music tastes. At least in this case, there’s an option to ‘mute’ the people who don’t. The music comes from YouTube, Vimeo, SoundCloud and Bandcamp, and each user gets their own profile page of songs that they have shared. TechCrunch reports that Serendip is backed by nearly $1m in seed funding.