By Gary Marcus and Ernest Davis
In his testimony before Congress this year, Mark Zuckerberg, the chief executive of Facebook, addressed concerns about the strategically disseminated misinformation known as fake news that may have affected the outcome of the 2016 presidential election. Have no fear, he assured Congress, a solution was on its way — if not next year, then at least “over a five- to 10-year period.” The solution? Artificial intelligence. Mr. Zuckerberg’s vision, which the committee members seemed to accept, was that soon enough, Facebook’s A.I. programs would be able to detect fake news, distinguishing it from more reliable information on the platform.
With midterms approaching, along with the worrisome prospect that fake news could once again influence our elections, we wish we could say we share Mr. Zuckerberg’s optimism. But in the near term we don’t find his vision plausible. Decades from now, it may be possible to automate the detection of fake news. But doing so would require a number of major advances in A.I., taking us far beyond what has so far been invented.

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