Fakebook is a Facebook-look-alike Web site created in January 2011 by Russel Tarr, a teacher at the International School of Toulouse, France. The Web site is rapidly becoming a popular teaching tool for science, history, and other school subjects, with a quarter of a million hits per week, Tarr says. In December alone, 14 Hydrogen profiles appeared on the site. “Kids love Facebook, and you always have to latch on to what they're enthused about and channel it into the classroom,” he says.