Facebook users are dealing with yet another issue. This time, a glitch allowed millions of users' posts to go public last month. The bug resulted in 14-million people having their default setting for new posts set to public. The error happened during four days from May 18th to the 22nd while Facebook was testing a new feature.
Facebook DID go back and change those settings for users once the bug was discovered. On top of that, those users who were affected will be notified by the company.
You may want to check your settings again.