I have received a couple of requests by people I know to connect with them via www.linkedin.com. i looks sort of like a Facebook but targeted towards professional networking. honestly I'd rather not 'social network' anymore than i have to, but if it has a chance of improving my career (the (non-bass-playing, day job), and potentially opening doors that may not otherwise be on my radar, it seems like it could be worth it. Have you sued likedin.com, in your (non-musician) career? what are your impressions?