While we Yanks are stuck behind the times, still leaving messages on MySpace profiles, the Brit kids have already moved on to the next Internet craze: Bebo. According to the Nielsen NetRatings, Bebo had 1.5 million British visitors in December, topping U.K. MySpace visits for the first time and making it the biggest social-networking site across the pond. In the seven months since launching worldwide, Bebo's membership has grown to 22 million. That's still well short of MySpace, recently surpassing 54 million registered users, but, nonetheless, Bebo's quickly gaining ground. — Matt Schneiderman