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			 In an escalation of pressure on technology firms to do more to 
			combat online propaganda from groups such as Islamic State, the 
			meeting follows attacks in Paris and San Bernardino, California, 
			that underscored the role played by social media companies such as 
			Twitter Inc, Alphabet Inc's YouTube and Facebook Inc. 
			 
			Invited participants include White House Chief of Staff Denis 
			McDonough, presidential counterterrorism adviser Lisa Monaco, 
			Attorney General Loretta Lynch, FBI Director James Comey, National 
			Intelligence Director James Clapper and National Security Agency 
			Director Mike Rogers, one of the sources said. 
			 
			A source familiar with the meeting said it would focus on social 
			media content, not encrypted communications, another topic of 
			discussion between Silicon Valley and the White House. 
			
			  Twitter, Apple Inc, Facebook and Google are attending, the companies 
			said. Several other Internet firms, including Microsoft Corp and 
			Dropbox, are expected to attend, according to those familiar with 
			the meeting. Most companies are expected to send high-ranking 
			executives, but not their chief executive officers. 
			 
			An administration announcement is expected following the conclusion 
			of the summit, according to a source. 
			 
			Twitter last week updated its policies for policing its content to 
			explicitly prohibit "hateful conduct." Other websites have similarly 
			updated and clarified their abuse policies within the past 18 
			months. 
			 
			The meeting agenda covers how to make it harder for militants to 
			recruit and mobilize followers on social media, as well as helping 
			ordinary users create, publish and amplify content that can undercut 
			groups like Islamic State. 
			 
			
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			The meeting also will touch on how technology can be used to disrupt 
			paths to violent radicalization and identify recruitment patterns, 
			and how to make it easier for law enforcement and intelligence 
			agencies to identify militant operatives. 
			 
			The Obama administration "has been clear about the importance of 
			government and industry working together to confront terrorism, but 
			we do not have any specific meetings to announce or preview at this 
			time," a senior official said. 
			 
			Amid rising public concern about the potential for more attacks, 
			President Barack Obama in a speech in December said, "I will urge 
			high-tech and law enforcement leaders to make it harder for 
			terrorists to use technology to escape from justice." 
			 
			Tech firms have been increasingly cooperative, taking down content 
			viewed as capable of inciting violence or recruiting militants. But 
			those same firms are often reluctant to appear too cozy with 
			government investigators, a concern that grew after Edward Snowden 
			disclosed wide government surveillance. 
			 
			(Reporting by Dustin Volz and Mark Hosenball; Editing by Kevin 
			Drawbaugh, Will Dunham and Lisa Shumaker) 
			
			[© 2016 Thomson Reuters. All rights 
			reserved.] 
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