Zurker is a social media site similar to Facebook. The big difference I see from Facebook is that it's a bit more organized and sharing links, pictures, etc works a little differently. It's better in some ways, worse in others.
It's still in the beta stage of development and is offering credits to people who bring referrals to the site. The credits are supposed to be exchanged for shares in the company when the site goes public. It seems like they plan on trying to build it up and sell it to a larger company once it gets going. I'm on there, feel free to connect if you end up joining. http://www.zurker.com/william