This is a very good study for people who design websites:
http://shine.yahoo.com/power-your-future/eye-tracking-study-shows-people-really-look-facebook-223900573.html
Ok. I'm glad I look so good.
I do very little interaction on Facebook but do look around. This is correct at least for me as I do pay attention to the profile pic.
That's what we do here at my Web Development company, make sure there's lots of pictures.