Ukrainian officials say Facebook was used to spread disinformation and propaganda in their country before Russia carried out similar interference in the 2016 U.S. presidential elections. Subscribe on YouTube: bit.ly/1BycsJW Facebook insiders reveal details about how Mark Zuckerberg and Sheryl Sandberg prepared to take the rapidly growing business to the next level by going public. In a scene from FRONTLINE’s upcoming documentary, “The Facebook Dilemma,” hear from insiders about the company’s decision to ramp up its data collection on users. Watch "The Facebook Dilemma" starting Mon., Oct. 29: www.pbs.org/facebookdilemma Twitter: twitter.com/frontlinepbs Facebook: www.facebook.com/frontline Instagram: www.instagram.com/frontlinepbs FRONTLINE is streaming more than 200 documentaries online, for free, here: to.pbs.org/hxRvQP Funding for FRONTLINE is provided through the support of PBS viewers and by the Corporation for Public Broadcasting. Major funding for FRONTLINE is provided by the John D. and Catherine T. MacArthur Foundation and the Ford Foundation. Additional funding is provided by the Abrams Foundation, the Park Foundation, The John and Helen Glessner Family Trust, Wyncote Foundation, and the FRONTLINE Journalism Fund with major support from Jon and Jo Ann Hagler on behalf of the Jon L. Hagler Foundation.