FILE - In this April 18, 2017, file photo, conference workers speak in front of a demo booth at Facebook's annual F8 developer conference in San Jose, Calif. Facebook said Thursday, Jan. 11, 2018, that it is tweaking what people see to make their time on it more “meaningful.” The changes come as Facebook faces criticism that social media can make people feel depressed and isolated. (AP Photo/Noah Berger, File)
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