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- Insider reported last week that data for 533 million Facebook users was posted on a hacking forum.
- Facebook on Tuesday said the data was "scraped" sometime before September 2019.
- Its explanation for what happened doesn't quite make sense.
- See more stories on Insider's business page.
Facebook wants you to know that the leak of 533 million users' data on an online hacking forum wasn't a hack — or at least not a new one.
Insider reported on Saturday that 533 million Facebook users' personal details, including names, email addresses, and phone numbers, had been posted to a low-level hacking forum.
Facebook published a blog post on Tuesday explaining why it had not disclosed the apparent breach.
Facebook said the data had not been obtained by hacking into its systems. Instead, it said it had been scraped off the platform at some point before September 2019.
"Scraping is a common tactic that often relies on automated software to lift public information from the internet that can end up being distributed in online forums like this," the Facebook product-management director Mike Clark wrote in the blog post.
Clark said the method used to obtain the data exploited a vulnerability in Facebook's contact importer, a tool that allows users to find the Facebook profiles of people using phone numbers. Facebook says that it fixed that particular vulnerability in August 2019 and that it was previously reported on.
This would mean it was not a new breach and the company therefore wasn't obliged to notify anyone about it.
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As reported by Wired's Lily Hay Newman, however, Facebook's timeline doesn't quite make sense.
Facebook's post links to a September 2019 CNET article as an example of previous reporting on the data leak. CNET's article refers back to a September 2019 article from TechCrunch, which details a server containing the data of 419 million Facebook users being exposed online.
A Facebook representative told TechCrunch in 2019: "This data set is old and appears to have information obtained before we made changes last year" — 2018 — "to remove people's ability to find others using their phone numbers."
Given that Facebook has said the vulnerability for the most recent data breach was plugged in August 2019, this would suggest the dataset mentioned by the CNET and TechCrunch articles is different from the one Insider reported last week.
Newman also reported there were observable differences in the two datasets, such as in the proportion of users from various countries.
The company did not immediately respond to Insider when asked to clarify.
Facebook must be precise in its statements about exactly what data was leaked and when, or else it could draw the ire of regulators.
Facebook reached a settlement with the US Federal Trade Commission in July 2019, which requires it to report security breaches to the agency.
Ireland's Data Protection Commission on Tuesday announced it was looking into the dataset and whether it contained leaked data that wasn't previously reported.
According to the DPC, Facebook said the recent data set could have been cobbled together from older breaches. "The data at issue appears to have been collated by third parties and potentially stems from multiple sources," Facebook said.
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