Bad Manners and Brimstone

I am friends in FB with a woman at work.  She and her friends were arranging a get together and they were all posting their phone numbers on the post.  The post was originated by someone else who I wasn't friends with, but I was seeing all of their phone numbers because I was a "friend of a friend".  I did an FYI private message to my friend letting her know if I could see the post of HER friend, then so can all of the other "friends of friends" and everyone who read it now had her phone number.

Shortly after I mentioned that, she modified her post, and I noticed that almost all of the other phone numbers were soon gone.