Security researchers discovered a large volume of Facebook (FB) - Get Facebook, Inc. Class A Report user data sitting unprotected on an Amazon web server in yet another example of the social network or its partners failing to adequately protect its users' data.  

Researchers at the cybersecurity firm UpGuard discovered troves of Facebook user information on an Amazon cloud computing server, Bloomberg reported. The data included email addresses, passwords, comments, likes, and account names in two instances that were discovered by the researchers. 

In one example, a Mexico-based company called Cultura Colectiva was storing 540 million Facebook records openly on the server. In another, a defunct third-party app called At the Pool listed names, email addresses and passwords of 22,000 users. 

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Both databases were either closed or became inaccessible after Facebook was notified of their existence. 

Facebook shares fell about 1.4% following the report's publication at 1:23 PM ET and are now about flat for the day.

Facebook recently acknowledged that hundreds of millions of user passwords were improperly stored in an unencrypted format on its servers for years. 

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