A friend and I thought up SocialCla.us over the weekend and have spent the last few nights building it after work. SocialCla.us makes it easy to start Secret Santa groups with your Facebook friends.
Feedback is appreciated!
Oh and "Copyleft" in the footer made me chuckle.
We make it easy to facilitate the creation and organising of Secret Santa groups, not the actual gift exchange itself. That's up to users to figure out.