Social networking is great and all, but you can't really fault anyone for not buying into it. Unless, of course, you're talking about Facebook. Everybody has a Facebook, except for the people who don't, and they tend to be few and far between.
Whether it's a hipster statement, like not owning a TV, or an attempt at privacy in the allegedly post-privacy age, people without Facebook accounts are definitely in the minority. What do you think when you meet someone (in real life, presumably) who doesn't have one? Do they tend to be holier-than-thou? Weird? Secretive? Or just totally normal folks who don't dig Facebook for one reason or another? Do you think there's a stigma?