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 Catherine Cook when they were high school students, myYearbook is also the fastest growing social site, PhillyBurbs.com cites HitWise figures as showing, with market share growth of “426% in the past year alone. Visitors to myYearbook.com spent more time on the site than they did on the two leading social networking sites, MySpace and Facebook. The average visit was 32 minutes and 54 seconds for myYearbook, compared to 29:54 for MySpace and almost 21 minutes for Facebook.” Favorite features among its users, according to myYearbook, are “‘Match,’ which enables them to make new connections online; ‘Battles,’ where members battle for ‘Best Looking’ or ‘Cutest Couple’; ‘Pimp,’ an all-out profile customization tool with all the glitters and animations anyone could ever want; and ‘myMag,’ where young people sound off on issues like anorexia, cliques, relationships, and the fashions and foibles of their favorite celebrities.” The site added “Video Battles” and “myMag” last July.