londrum - 10:40 am on Nov 21, 2010 (gmt 0)
aren't a lot of those facebook buttons that people have on their sites iframes?
presumabely that means everytime someone visits their site a pageview gets logged for facebook too. so maybe those stats aren't as good as they look.
just had a quick look at facebook's page which tells you how to implement the buttons. it says "There are two Like button implementations: XFBML and Iframe".
i bet you any money that is why they've got so many pageviews.
just thinking off the top of my head i remember that lots of newspaper sites have like buttons under all their stories. every time someone reads one of those, facebook's stats go up.]