I wish I'd learned long ago to not include any personal info. Once you've done it, they have it, whether you delete it or not. Quizzes are for generating targeted ads. Don't tag pictures with other people, locations, or organizations for the same reason. That pretty much does away with any real use FB offers, though. It's like filling out warranty cards: sure, you might actually get some good out of it, but the main thing you get is ever more junk mail and your personal info disseminated into the ether all the more.
I have 200 people on my FB list, and it's too many. Half of them I've hidden. If I don't voluntarily interact with you on a regular basis or know and like you on a personal level, I'll reject your list request. That would mean that you're an acquaintance, not a friend of mine...they are not the same, and that means that I don't really want to see pictures of your dogs and toenails, or what inane thing you like or news report you want to spam me with, which is pretty much all FB is used for these days. I don't list co-workers unless I'm friends with them outside work, a good chunk of my family, or even the loveable listeners of my radio show.