Facebook this week began notifying about 14 million users that posts published to Facebook during the period of mid-May might have been made public due to a bug.
The company claims the audience selector tool was accidentally set to public for a large group of users. Normally, the tool reflects whichever setting the user last selected, such as sharing to smaller groups of friends.
Facebook insists that the bug did not impact older posts, and that it did not prevent people from selecting their audience as always. Facebook suggests people go back and check to see if their posts were shared publicly or privately during the timeframe involved.
The bug has since been resolved.
