I have an extremely difficult time believing this. I actually don't know another person IRL over the age of 18 who doesn't have a FB account. I know a couple of people who've claimed to have "deleted" or "deactivated" theirs, but not another person whose never had one.

To be fair it was from a self reported survey and they were asked if they ever used FB. If it were me I would probably answer no, even though that is not strictly true. I did use it once in 2010, but I didn't inhale. :)