There is a new social site called Qassia that's still in beta. Submit information to the site and add your backlinks to this "do follow" social engine. It looks promising, so get in while it's still in beta and get some link juice. Currently it's by invitation only so here is an invitation link. http://donvito.qassia.com/
Qassia already came out of beta and no longer invitation only. anyone can join and get backlinks now. i have a Squidoo lens that i setup which describes Qassia in great detail and how it works. Qassia