Finding 50 new comments is a wonderful sign your blog has reached a level of popularity, until you see they are all for sites that no human would visit. Time to get the anti-robot patrol on full-time duty.
Social networks can be driven by a few active and vocal members in a way that pushes other members away. One a larger scale, the million-plus member sites have a relative minority of abusers, scammers, stalkers and the like which do chase people to other sites (or away from social networking sites entirely).
