PUBLIC MARKS with tags friendster & sns

When it comes to social life on the Internet there are two websites that matter: Facebook, with it's 6 million (11 million?) members, and MySpace with its 47 million. Friendster is old news and TagWorld doesn't matter. Which is better? For college students graduating this spring -- should you stick with Facebook or switch to MySpace? For high-school students -- should you switch to the new Facebook highschool-edition, or stick with MySpace? For two websites that essentially do the same thing, it seems like a real comparison is in order.