Hey guys, I'm running a Pligg based social bookmarking website and am only earning $3/day via adsense. The site gets over 10k visits/200+ articles/100+ members in a day (you could see the stats in the image below). In order to submit the articles, the user has to go through 3 steps and be registered. I'm not sure how advanced bots are, but I'm getting the feel that a huge percent of all submitted articles are from bots. If anyone has any suggestions or tips I would love to hear them. Thanks!