Picking through the bones of the Iowa result and its implications for online campaigning it is a reasonable hypothesis that the huge increase in the youth vote at caucus might have had something to do with the result itself. Clinton slipped badly while Edwards did better than expected and Obama did very well indeed. See this article by Michael Connery at the Daily Kos, which argues that

"Young voters are increasingly moving in the direction of Democrats, and tonight, the Obama campaign - thanks to a savvy youth operation that reached out on Facebook and MySpace, at high schools and on college campuses - was able to capitalize on that to attain victory."