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			 The annual report lists a variety of requests the site has received 
			for information on users and for removal of content. On Thursday, 
			Reddit deleted a paragraph known as a "warrant canary." 
 The paragraph had said that Reddit had not been subject to national 
			security letters, which are used by the FBI to conduct electronic 
			surveillance without the need for court approval, or "any other 
			classified request for user information."
 
 Privacy advocates have long contested the letters, saying they are 
			not subject to sufficient judicial oversight or transparency 
			safeguards.
 
 Brett Max Kaufman, an attorney with the American Civil Liberties 
			Union, said on Friday that authorities were possibly seeking the IP 
			address, or an identifying number that corresponds to a specific 
			computer, of an anonymous user on Reddit. Private messages between 
			users could also be subject to search.
 
			
			 
			Reddit collects relatively little customer data that could be 
			subject to a national security letter and useful for investigators, 
			Kaufman said. Reddit does not require users to reveal their 
			identities and stores less customer data overall compared to email 
			or other social media such as Facebook, he said.
 Edward Snowden, the former National Security Agency contractor who 
			gave classified documents about U.S. spying to journalists in 2013, 
			expressed concern on Twitter.
 
 "Is dissent a threat to national security?" tweeted Snowden 
			(@Snowden), whose leaks prompted a vigorous international debate 
			about digital privacy and surveillance.
 
 The leaks helped popularize the use of "warrant canaries" by tech 
			firms eager to display resistance to government attempts to obtain 
			access to user data.
 
 "When you ask someone 'Are you helping authorities in 
			investigations?' and they say 'I'm not allowed to discuss that with 
			you,' I think the question has been answered," wrote Reddit user 
			khegiobridge.
 
 National security letters are almost always accompanied by an 
			open-ended gag order barring companies from disclosing the contents 
			of the demand for customer data, making it difficult for firms to 
			openly discuss how they handle the subpoenas.
 
 That has led many companies to rely on somewhat vague warnings. 
			Apple previously had a "warrant canary" but removed it in 2014.
 
			
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			"I've been advised not to say anything one way or the other," Reddit 
			Chief Executive Officer Steve Huffman, who goes by "spez" on the 
			site, said in a thread discussing the change. “Even with the 
			canaries, we're treading a fine line.”
 The FBI can use national security letters to compel Internet and 
			telecommunications firms to hand over a wide range of customer data, 
			including web browsing history and records of online purchases.
 
			San Francisco-based Reddit did not respond to a request for comment. 
			The Federal Bureau of Investigation did not respond to a request for 
			comment.
 National security letters have been available as a law enforcement 
			tool since the 1970s, but their frequency and breadth expanded 
			dramatically under the USA Patriot Act, which was passed shortly 
			after the Sept. 11, 2001 attacks on the United States by Islamist 
			militants.
 
 Several thousand of the letters are now issued by the FBI every 
			year. At one point more than 50,000 such letters were issued 
			annually.
 
 In 2014, Twitter sued the U.S. Department of Justice on grounds that 
			the restrictions placed on its ability to reveal information about 
			government surveillance orders violates free speech rights. Reddit 
			and others have filed friend of the court briefs in Twitter's 
			lawsuit.
 
 (Reporting by Dustin Volz; Additional reporting by Amy Tennery, 
			Anjali Athavaley and Melissa Fares in New York; editing by Frances 
			Kerry and Grant McCool)
 
			[© 2016 Thomson Reuters. All rights 
				reserved.] Copyright 2016 Reuters. All rights reserved. This material may not be published, 
			broadcast, rewritten or redistributed. 
			
			
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