WATCH LIVE: Mark Zuckerberg faces second round of questioning at House's Facebook hearing
Facebook CEO Mark Zuckerberg during the II CEO Summit of the Americas on the sidelines of the VII Summit of the Americas in Panama City in this April 10, 2015 file photo. REUTERS/Carlos Garcia Rawlins/Files

Facebook co-founder Mark Zuckerberg returns to Congress on Wednesday to answer more questions about the social media network. The 33-year-old CEO is scheduled to testify at 10 a.m. (ET) in the House Energy and Commerce Committee. Watch live video below: