https://finance.yahoo.com/news/facebooks-sandberg-says-zuckerberg-remain-161003730.html

"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.