"When it comes to social networking, one golden rule seems to apply: If you share it with Facebook, you share it with the world. Whether or not Facebook makes it crystal clear, the onus is on the user to protect their personal information. This fact was plainly demonstrated over the weekend and confirmed by Facebook.
On October 5, a young man with a penchant for code detailed in his blog just how easy it is to collect phone numbers and corresponding Facebook accounts. With a simple line of code he was able to quickly run countless phone numbers through the Facebook mobile site and match up users to his random numbers. He says that he discovered how easy this was to do months ago and even emailed Facebook about the lax security. When someone with Facebook did respond, they didn’t seem to understand that he could easily collect personal data and use it for far more than requesting a new friend."