Have my digits, Facebook!

I noticed that there are a lot of "Lost my Phone" groups on Facebook, which I think is a brilliant way to get your friends to send their digits to you ASAP if the phone goes on the fritz. But as I send a private message to the person who did lose their phone, with my number in it, I visited the group and found that people were putting their phone numbers on the group Wall. Just... digits. Essentially placing their phone numbers on a free public listing.

Is it me, or is that purely insane? I go so far as to tell the salespeople at stores that I'm unlisted (I only own a cell phone) because I don't want/need strangers calling my number. I've had enough wrong numbers coming in that I don't even introduce myself if someone asks "Who is this?!" Does anyone in the next generation realize the Internet is a public place? Granted, you have to be careful with what you put into any website, as I mentioned in my phising post last year. Who knows how these websites store data? Do they wipe it out every year, two years, three years?

I love the word flabbergasted, but I'm even beyond that right now. Either they don't know that some freak could get their number and harass them, or they just don't care. Is there an Internet Sensibility group on Facebook I could point them to?