Pew Research CenterMay 27, 2016

Vietnam restricted access to Facebook during Obama visit: activists

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Pew Research CenterApril 1, 2016

Egypt blocked Facebook Internet service over surveillance – sources

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Pew Research CenterJanuary 25, 2016

Top Twitter executives to leave company, CEO Dorsey tweets

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Pew Research CenterJune 12, 2015

Twitter’s Dick Costolo to Step Down as CEO in Yet Another Shake-Up

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