[dwiel]

I think its both. While it may be possible in your group of friends to quit Facebook, it might not be so for other people. Imagine quitting the telephone. People were social long before the telephone was around, and can remain so without it. I know that quitting Facebook wouldn't harm my socialization too much, but quitting the telephone probably would. I can imagine people for whom quitting Facebook would have similar effects as me quitting the telephone.