| The 
				social media platform is investing billions of dollars a year to 
				improve the security of its network, Sandberg said in an 
				interview hosted by German newspaper Die Zeit and UK law firm 
				CMS at the World Economic Forum in Davos, Switzerland.
 "We did not anticipate all of the risks from connecting so many 
				people," Sandberg said, adding that the site had added features 
				that give users greater control over their personal information.
 
 The 15-year-old technology company has been a darling of 
				California's Silicon Valley, making stars out of its founder, 
				chief executive and chairman Mark Zuckerberg, and Sandberg, 
				known for her feminist manifesto "Lean In". But its shares have 
				fallen roughly 33 percent since July to $144 due to concerns 
				about user privacy.
 
 Last year, the company was buffeted by revelations that UK 
				consultancy Cambridge Analytica had improperly acquired data on 
				millions of its U.S. users to target election advertising.
 
 "We need to earn back trust," Sandberg said.
 
 Some of Facebook's major shareholders have pushed for Zuckerberg, 
				who has majority control of the company, to step down as 
				chairman.
 
 Sandberg said he should remain both chair and CEO. She said that 
				she also plans to remain at Facebook, where she has worked since 
				2008.
 
 "I think I have a job to do," she said. "It's a job I really 
				want to do."
 
 Sandberg said that if Facebook had to change its business model 
				and charge users a subscription fee instead of collecting 
				advertising revenue, far fewer people would be able to use it.
 
 "Fundamentally disallowing our business model would harm a lot 
				of people all over the world."
 
 She said her grassroots women's movement, spurred by the 
				publication of "Lean In", was still going strong. But, asked if 
				she was considering a run for U.S. president in the 2020 
				election, she replied : "It's not on my agenda."
 
 (Editing by Mark Trevelyan)
 
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