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Investigators Chase Missing Pieces Of Facebook, Twitter Role In Russian Meddling

In this photo taken Tuesday Feb. 3, 2015, Facebook chief operating officer Sheryl Sandberg answers questions during an interview at Facebook headquarters in Menlo Park, Calif. Sandberg is in Washington on Capitol Hill this week meeting with lawmakers and investigators. (AP)
In this photo taken Tuesday Feb. 3, 2015, Facebook chief operating officer Sheryl Sandberg answers questions during an interview at Facebook headquarters in Menlo Park, Calif. Sandberg is in Washington on Capitol Hill this week meeting with lawmakers and investigators. (AP)

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