I agree with the Facebook statement my parents are active with it plus older family members and friends (I'm middle aged myself) I also think one of the reasons Facebooks has thrilled since people have learned for past mistakes with Myspace, -such as, saying things or posting pictures that job prospects won't like or even get you fired from a current job, Thanks to that folks are more careful on what the post on Facebooks.
There are too many of these social web sites, they need to come up with a application or web site that lets you sign up to all of them in one shot. When a new site starts it should automatically register you, this would be ideal for lazy people...oh I mean busy like myself.
I'm new to blogging and my site is barely a month old and the majority of traffic have been from forums. Now I have been checking out other blogs for link exchange etc which seems to be increasing my traffic.