I happened accross an ex-boyfriends phone number on facebook, because I am close friends with his cousin!!! She commented on a quote of his, added some of her own info to something he said and she all of a sudden had the quote (along with HIS PHONE NUMBER) on HER facebook page!!! He got mad at himself for posting it, because some old weird friend of his in H.S had a crush on him back then, she started CALLING HIM about 2 days after his number was posted!!! AND SHE WASN'T FRIENDS WITH HIM...she was Friends of a FRIEND that his cousin had on her FB page!!! this just happened a few weeks ago!
ALSO, it's scary, because if your kids friends aren't honest, respectful people- it only takes ONE to copy the number and put it on their page or give it out to others.
Just because people are 'facebook friends' doesn't mean that they are people that should have your kids phone number. ALSO, look at the THOUSANDS of people who are ON facebook that just go looking to get the most friends they can (even if they DON'T know the person in real life!!!)
It is NOT safe to put a phone number on ANYONE'S page.