MyCult
SEO to the FACE
Found this and have been playing for a few days, it's really good the concept is very original.
Very cool, worth a look.
In private beta at the moment you have to sign up then later an invite is sent out to you. If anyone is interested I can issue some invites so you don't have to wait PM me an email to send the invite to.
Fire Fox only but then again all the best things are.