When my high school friends and I buy things as a group I always push to keep track of who paid for what and then enforce the IOUs. "We’re all friends, don’t worry about it" is a rejoinder I put up with. No longer. With BillMonk, a helpful new web service to track IOUs amongst individuals and groups online or via text messages, I can dog my friends to get paid back!
(Hat tip: TechCrunch)