A hugely popular ghetto.http://trends.google.com/websites?q=myspace.com%2Cfacebook.com&geo=all&date=allI was just talking to a guy in the travel space who claimed that his ads in FB are getting about the same ROI as search ads, he's basically claiming that the poor conversion rate is made up for by the low CPC. In my experience the conversion rate has been near zero, so I'm not seeing it.