I agree with that statement, but many times, people might not realize that they are sharing their phone number or some other piece of personal information with

I agree with that statement, but many times, people might not realize that they are sharing their phone number or some other piece of personal information with the world. I only recently signed up to develop Facebook Applications, and they required me to verify my account by giving them my mobile number so they could text me a code. In doing so, this tied my cell phone number to my account and broadcast it to the world until I checked to make sure it was not doing so a day later.