Facebook sent flawed data to misinformation researchers.

Mark Zuckerberg, chief executive of Facebook, testifying in Washington in 2018.
Credit…Tom Brenner/The New York Times

More than three years ago, Mark Zuckerberg of Facebook trumpeted a plan to share data with researchers about how people interacted with posts and links on the social network, so that the academics could study misinformation on the site. Researchers have used the data for the past two years for numerous studies examining the spread of false and misleading information.

But the information shared by Facebook had a major flaw, according to internal emails and interviews with the researchers. The data included the interactions of only about half of Facebook’s U.S. users — the ones who engaged with political pages…

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