The US's top 5 social network sites in terms of visitors in April (the latest figures available) are MySpace, Facebook, myYearbook, Bebo, and BlackPlanet, in that order, according to Web traffic research firm Hitwise. Interestingly, this was also the ranking order for the sites in terms of returning visitors and time spent on the sites. MySpace's April market share was 73.82%, Hitwise said, … [Read more...] about US’s top 5 social network sites