Listen....Facebook isn't just adults. Hasn't been for a long time now. You can't act like it is any more. I've seen kids as young as 9 with Facebook accounts (yes in violation of blah blah blah...).
The one strange thing I find with Facebook is the people who INSIST on swearing, posting risque pics and more. They act like everyone who might ever friend them would like what they post. Fortunately my friends don't do this often. The real problem is on product pages. I see swearing, threats of volence and other issues on product pages like Chevy's! A product page is not your personal graffiti board! Not everyone wants to see that stuff and I SURE as heck don't want my son to see it.
I put it this way.....would you paste a pic of your naked wife on your front door? When you do that on Facebook....depending on your settings....THAT IS WHAT YOU ARE DOING!
Facebook=public.....if you go that route when you post stuff....even if just to your friend list....then you probably won't have any issues.