https://www.reuters.com/article/us-facebook-cambridge-analytica/facebooks-zuckerberg-to-testify-before-u-s-congress-source-idUSKBN1H3121

Facebook Inc Chief Executive Mark Zuckerberg plans to testify before U.S. Congress, a source briefed on the matter said on Tuesday, as he bows to pressure from lawmakers insisting he explain how 50 million users' data ended up in the hands of a political consultancy.