This is probably not of interest to anyone but my friends, fans (all three of them), and inquisitive HR people. Enjoy!
Facebook: Chris Mahan. My facebook-friend policy: If I wouldn't invite you to my house, I won't facebook-friend you.
Twitter: chris_mahan. Active!
Stackoverflow: Christopher Mahan.
Google Buzz: No.
Plaxo: No. Deleted my account.
Friendfeed: No. Deleted my account.
Linkedin: Christopher Mahan.