https://www.cnbc.com/2018/04/10/facebook-fb-stock-zuckerberg-speech-in-washington.html >Facebook shares surged 4.5 percent on Tuesday as CEO Mark Zuckerberg appeared before U.S. lawmakers on Tuesday. >The stock was already up about 2.5 percent at 2:20 p.m. ET, around the time the hearing was set to begin.