Researchers find more cases of Facebook app data exposure

Security researchers at the firm UpGuard have uncovered more instances of Facebook user data being publicly exposed on the internet

But the episode illustrates Facebook's issues with controlling its users' data, especially once it is in the hands of third-party developers.

While the At the Pool data collection was not as large as that for Cultura Colectiva, UpGuard said it included plain text passwords for 22,000 users. The app itself shut down in 2014, and UpGuard said it is not known how long the user details were exposed.

The discovery comes a little over a year after Facebook's Cambridge Analytica scandal , in which the data mining firm affiliated with Donald Trump got personal data on millions of Facebook users.

"As Facebook faces scrutiny over its data stewardship practices, they have made efforts to reduce third party access. But as these exposures show, the data genie cannot be put back in the bottle," UpGuard wrote in its blog post. "Data about Facebook users has been spread far beyond the bounds of what Facebook can control today."