To be honest, I just spent a few minutes on it but it is not a site I would keep coming back to. There's no real value add, it is all the same content and has no draw to it. You need to read up on gamification, the art of rewarding people to draw them in and keep them coming like. Foursquare has badges Hacker News has karma Reddit also has karma Give people points, badges, etc for using the site and sticking around.…
Those are not the reasons I use Foursquare, HN, or Reddit (can't speak for others)
no, but it the reason that many other people do, and you end with the unique content that will make you wanna come nack