[elg0nz]

Get Feedback from your users. Find ways for them to play more with your site, for example even though reddit is a text only place there are lots of games users play like ITAP or GoneWild or AMA, what you should try to do is find ways for your users to play that kind of games.

Another good example is also Chatroulette where users play games like Tilt your head, Play you a song, show you the bird, etc.