I never had one, and you'd be surprised how many don't. This has caused me to miss camping trips, parties, dinners, and
weddings. Of course it's possible that I'm just such an obnoxious person that nobody wants me around, but if that were the case, I doubt I'd have received such abject and clearly heartfelt apologies from people who didn't invite me to things because I wasn't on their Facebook friends list.
Of course, such apologies always come with the implicit "...but if you don't get on Facebook, it's going to keep happening." I actually started to create a Facebook account, but refused to continue past the point where it asked for my email account credentials in order to construct a friends list from my correspondents.
Yes, I'm aware that's optional and can be bypassed - but when the relationship starts out with a boundary test as blatant and extreme as that, I'm really not interested in hanging around to find out where my new abusive partner is going to decide to go from there.
So I still don't have a Facebook account. As a direct result of this, I also don't have a meaningful social life any more, which is a shame, because I rather enjoyed the one I did have. I'm hardly alone in this. Is it any wonder there are people who want to kill Facebook with a hatchet?