Hey Rak:
You have a great list going… Question: Why are you putting energy into MySpace? Have you seen a great return? Am I missing something?
Also, you should really consider StumbleUpon. Quick figure for you, as of August 2011, StumbleUpon generated 48% of all social media traffic. Whereas Facebook generated 40%. Pretty impressive numbers seeing as how StumbleUpon has 15 million users compared to FB’s 500 million.