In the meantime, Facebook has set any public posts from that period to users' previous default settings, meaning that even users who meant to make posts public will need to reset them to be globally accessible.
Facebook CEO Mark Zuckerberg was questioned for two days on Capitol Hill in April about the importance of user security.
Just this week The New York Times reported the company had granted dozens of hardware manufacturers access to a trove of personal data, potentially violating a 2011 consent decree with the Federal Trade Commission, in which Facebook agreed it would only share users' data with their express permission.
To correct the error, Facebook said it has since changed all of the affected users' settings back to private - even for those aforementioned extroverts who freely keep the public apprised of all their comings and goings. That default was changed to public for the 14 million users, but if affected users noticed, they could have manually switched the setting themselves. Facebook stopped the bug on May 22 but did not restore the proper privacy settings to all posts until May 27.
Affected Facebook users will get a notification on the app or website starting Thursday.
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It's the latest in a series of revelations about Facebook's privacy lapses.
The news followed a recent furor over Facebook's sharing of user data - oversharing, in the eyes of many critics.
Ms Egan says the issue did not affect past posts and has apologised for the mistake.
A message will prompt them to "Please Review Your Posts", while a link will direct the user to view a list of what they shared during the 10 days that the bug was active.
Facebook tells TechCrunch that it hears loud and clear that it must be more transparent about its product and privacy settings, especially when it messes up.
Facebook says the issue has now been fixed and that the user's privacy settings have been returned to their original state.