https://www.reuters.com/article/us-spacex-musk/musk-deletes-facebook-pages-of-tesla-spacex-after-challenged-on-twitter-idUSKBN1GZ2MZ >Verified Facebook pages of Elon Musk's rocket company SpaceX and electric carmaker Tesla Inc disappeared on Friday, minutes after the Silicon Valley billionaire promised on Twitter to take down the pages when challenged by users.