My FB account is linked to an email address I rarely use - NOT my main one. I don't trust them not to spam me or sell my address.

I had to add a note to my profile, "I don't do apps or games" but I don't think it did any good. Still getting invites.

I started using FB a couple of years ago. My daughter deployed to Iraq and we kept her then 19-26 month old son ( she didn't trust her husband, imagine that!). I set up the account so I could share pictures of her little guy. I now use it daily to keep up with my four grandchildren, other family members, news, fitness & health info, quilting sites, Major League Baseball.