Countering extremists online remains elusive in Congress

By Dustin Volz WASHINGTON (Reuters) – Fighting violent extremism online will be the focus of private briefings this week for members of the U.S. Congress from law enforcement officials and Silicon Valley executives, as Washington struggles to formulate a coherent strategy. The classified briefings, scheduled weeks ago, come as Washington policymakers grow increasingly alarmed at how the Islamic State militant group uses technology to recruit online and evade surveillance detection

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