Twitter - I use twitter to check up on new game soundtracks/fan releases and check out other game music composers. My tweets range from music of both classical and game origins to retweets of about anything that catches my interest.
Rhythmroo.com - While it may not be a social networking site...you'll get a better idea of my likes and dislikes in music, which is very relevant to the topics I engage in much of my conversations. I like game music...what can I say? [It's currently set on Private until I fix one last item on there]