A report out Wednesday by UpGuard said two third-party Facebook app developers posted the records in plain sight, causing yet another major data breach for the world's biggest social network.
It exposed 146 gigabytes of Facebook user data, including account names, IDs and details about comments and reactions to posts.
Separately, an app called At the Pool exposed databases that appeared to include data about user IDs, friends, photos and location check ins, as well as unprotected Facebook passwords for 22,000 users.
UpGuard said it alerted Cultura Colectiva and Amazon about the breaches from Cultura Colectiva in January, but no action was taken until Wednesday morning.
Facebook is under federal criminal investigation for deals it struck with electronics manufacturers to access user data, and it has been hit a series of security breaches over the past year.
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