About 3 more than any other typical day for me.
I don't even see the fancy about Facebook. I barely see the use for things like "Linked-In".
Xanga, Facebook, MySpace... all them one like them. I ignore them.
Ok, upto 6 minutes.
BTW 8,000,000,000 minutes =~ 14,150 years
Imagine if people really used that time for real purposes that helped the world. (and no using facebook isn't one of those things that "helps the world")