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Sen. Bernie Sanders speaks during a campaign rally in June 2016 at Qualcomm Stadium in San Diego, Calif. He launched a second presidential campaign on Tuesday, with a big burst of donations from supporters, but new challenges ahead. Sandy Huffaker/AP hide caption

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Sandy Huffaker/AP

The new look of Facebook's News Feed. Facebook hide caption

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The Life Cycle Of A Social Network: Keeping Friends In Times Of Change

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