At the beginning of last December, Ning reversed course on its anything-legal-goes policy by declaring a prohibition on adult social networks. The reason? Porn wasn't paying the bills; instead of attracting advertisers, it was scaring them away. Legal adult content was also begetting illegal content, which drew the ire of both authorities and lawyers with DMCA notices in hand. Given the report released by CPM Advisors at the beginning of 2008, which suggested that Ning relied on adult content for much of its traffic, one might expect Ning to take a hit after shooing the smut out the door.