Seems like this is how Facebook continues to do it. Expose the users without telling them that they're going to do it, wait for the backlash. If there's enough, backpedal on the decision. But only after giving the parties interested in the data plenty of time to mine a ton of it, making the reversal pretty much pointless.
Well played, Facebook. Yet another example of why you don't post anything on the Internet that you don't want known publicly.