According to comScore’s latest stats on social network sites, MySpace is still king and twice as large as its
nearest rival, Facebook. Both Facebook and Bebo have growth dramatically over the past year:

Having said this, we still don’t have any dominant social network in
many countries in Europe (including France, Spain & Italy). 2007 might be the last chance to launch a social network for European startups before the US social networks enter Europe aggressively in 2008.