I know some people who apparently have little life outside Facebook, but I wonder how widespread that is? If I believe someone may have an interesting Facebook website, how do I go and look at it? Without receiving a specific invitation I don't believe that's possible, is it?
Also, if I know several people who may have interesting Facebook sites, do I have to go to each in turn to find out what's on them? Sounds very time-consuming.
And lastly, I suspect that Facebook use is actually far less widespread than some would give us to believe.