Wow. Tough to say you really care about user privacy when you're handing really private data over to advertisers. As an advertiser? I don't even want this kind of information.
The Journal found that Facebook went farther than most in sharing identifiable data, by sending the username of the person clicking the ad as well as the username of the profile they were viewing at the time. This news could hardly come at a worse time for Facebook, a company that currently faces a privacy backlash potent enough to make the cover of Time Magazine this month.