The web existed prior to Facebook. You seem to be arguing that Facebook's very existence is the reason that other sites on the web can even exist, which seems to fly in the face of the history of the web.
No doubt you could find some interesting examples or some specific subgroups (my guess: the farmville playing middle aged mother on facebook with little technical aptitude, which is not an insignificant demographic) that have been pulled onto the net by facebook.
The numbers just don't show the kind of massive effect that you seem to be promoting here. It's hard to overestimate facebook's effect, it's a giant. But by saying that it's pulling up the entire rest of the internet you actually managed to do it.
What on earth is this theory based on?