....And in my eyes, this is the great thing about Facebook: Every single day my friends send me to videos, photos, articles, news and other stuff somewhere in the web that I would have never found or searched for by myself. Youtube is a good example. My main Youtube-navigation is not on their site - it's my Facebook news feed.
By the way:
This whole post in a simple graph can be seen here: http://epapa100.blogspot.com/2010/05/facebook-awesomeness-development.html