Comment #5 on that page is absolutely hilarious and so true...
I used to read this same kind of nonsense ("it's just a website") about Google. Some people just don't get the future. Read the quote at the bottom of this post: http://paulbuchheit.blogspot.com/2007/03/how-to-be-right-90-of-time-and-why-id.html
But from a technology point of view, Facebook is primitive. College projects at good CS schools are more interesting and challening. It's a freakin message board, just like that guy said.
I am not commenting on Google vs Facebook nonsense anymore.