6rounds is a social networking platform with a difference.

According to their blurb, users meet friends and friends to be, by inviting each other to 1 on 1 Rounds or by joining timed Rounds, where they are matched with other interesting new people based on common interests.  It's very whizzy and fun to use, but to join you need to request a code by entering your mail address, and it takes a while for them to get back to you.