https://www.reuters.com/article/us-twitter-trump-facebook-zuckerberg/zuckerberg-says-facebook-stronger-than-other-tech-companies-on-free-speech-idUSKBN2343C9 >Facebook Inc Chief Executive Mark Zuckerberg said on Thursday his company was more committed to free speech than other tech firms, as Twitter faced blowback from the White House for fact-checking tweets by U.S. President Donald Trump.