Facebook gained $21 billion during Zuckerberg's testimony
Facebook added nearly $21 billion in market value to $477.2 billion on Tuesday during CEO Mark Zuckerberg's testimony before US Congress. The company's shares posted their biggest daily jump in nearly two years on Tuesday, gaining 4.5%. Zuckerberg was called to testify after it was reported that personal information of 87 million Facebook users was harvested by Cambridge Analytica.