Facebook

The definitive social networking site. I'm normally pretty active on here, if you know me, add me as a friend. But ... applications ... just don't.

Twitter

The microblogging service. I'm still getting to grips with this.

Stack Overflow

The ultimate coding forum. I update in fits and starts on here, but it's good fun. It's also quite a good place to get to know people on a technical level.

YouTube

I generally only watch videos on here.

Ohloh

The open source network. I've only just discovered this. It looks interesting - not sure how active I'll be here.

LinkedIn

Professional social networking site. I keep this up to date, but generally am not very active.

SecondLife

Not quite a game, not quite a social network. I'm not on here too much, but feel free to find me if you're around. My nick' on here is "Kellar Noonan". This link goes to a map of second life. From there you can go straight to my home, if you've got the secondlife client installed.