Keeping up with the movers and shakers in Celebrityville takes a lot of dedication these days, what with the amount of media coverage available, both traditional and Twitter-like. If you find 24 hours are not enough in one day to stay informed, a particular 30 minutes on MTV each week might help fill in the info gaps. It's called ``10 on Top,'' and it's a half-hour countdown of the top-10 most texted and talked about young celebs from the past seven days. Their ranking is influenced by the amount of buzz they create among viewers, as well as any headlines they generate about upcoming projects and events. Host Lenay Dunn counts down the entertainers and also introduces exclusive behind-the-scenes footage.