https://www.reuters.com/article/us-facebook-cambridge-analytica-stocks/investors-lawmakers-advertisers-pressure-facebook-over-data-idUSKBN1GY1GI >Facebook Inc Chief Executive Mark Zuckerberg's apology for how his company handled 50 million users' data did little on Thursday to ease investor worries about the cost to fix mistakes and lawmakers' dismay that his response did not go far enough.