Good question. Doing is SMO is one thing and redirecting to visitor to your site is another. You have to use your brain to do so. Don't just promote your link or product through them. Rather give people very interesting knowledge as well. Participate in groups events, or you can invite your friends to the discussion board to discus over something. Comment on friend's links, pics and videos etc. Oh.. sorry to mention upload good pics videos off and on so that your page doesn't look monotonous. Slowly but steady you too will get a lot of traffic from them. Plenty more next time.