I have a facebook account because some stores post discounts there. I have set my privacy settings so that I can't be found in searches and I never finished filling out my profile past name, email address, and birthday anyway.
My friend found me through a common "like", and I ended up accepting her request, as well as ones from her dad and her husband. Since then, I've been refusing her friends and family, since I don't have a history or personal connection with them beyond talking to them at her kids' birthday parties.
However, Facebook recently changed something and my account opened up and my husband's grandmother's nephew found me.

I accepted him and fixed my settings, but now every couple of days I get another family member (from his list) asking to friend me.
I don't post anything, although my Goodreads account is hooked up and if I remember to go over there and add books, those get posted on my wall, but that's it. I'm only in it for the coupons! I'm accepting these recent requests, because they are family. I told my husband that if they all want to friend me and check out my local business links, they are welcome to it.