Another chart (from Comscore) showing how Facebook is the Google of social networks.    An online ad campaign can (in theory) target 62.4% of online Americans, with MySpace a distant second at 24.3%.

Sure, numbers aren’t everything and so while Twitter in theory has a reach of 3%, it’s potential and influence is higher.    But, Facebook remains just about the only game in town when it comes to mass consumer reach.