Under scrutiny for lax – or even broken – privacy policies, it has been uncovered that several popular social networking sites have been sharing personal data with advertising companies, despite a policy that says information is not shared without consent. The Wall Street Journal reported on Friday that “the practice, which most of the companies defended, sends user names or ID numbers tied to personal profiles being viewed when users click on ads. After questions were raised by The Wall Street Journal, Facebook (News - Alert) and MySpace moved to make changes. By Thursday morning Facebook had rewritten some of the offending computer code,” the article said. After yet another round of warnings found on Facebook status updates far and wide, Facebook last week announced that it is adding additional measures to make sure its members aren’t the victims of security breaches. As TMCnet’s Alice Straight reported, users can ask to be notified by e-mail or text message if their account is accessed from a computer or mobile device that hasn’t been used before.