It seems to fly mostly under the radar where adults and conventional news media are concerned but, according to Web traffic measurer Hitwise, myYearbook.com is now the third-ranking social network site in the US. That's according to Hitwise's figures for share of visitors this past April. My guess is, the site's smart to stay focused on high school-aged users. Founded in 2005 by siblings Dave and … [Read more...] about MyYearbook: US’s fastest-growing social site