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In this April 30, 2019 file photo, Facebook CEO Mark Zuckerberg, left, makes the keynote speech at F8, the Facebook's developer conference, in San Jose, Calif. Facebook's stock is plunging following a Wall Street Journal report that the Federal Trade Commission will lead any antitrust investigation into the company as part of an arrangement that would give the Justice Department oversight of Google. Citing unnamed sources The Journal said Monday, June 3 that the FTC secured the rights to begin a potential investigation into whether Facebook engaged in what it called "unlawful monopolistic behavior." (AP Photo/Tony Avelar , File)

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The federal government may be warming up its antitrust enforcement machine and pointing it at Big Tech.

By RRACHEL LERMAN AP Technology Writer June 4, 2019