Elon Musk called out an old Hillary Clinton tweet as a “hoax” Friday after a Twitter user flagged it for misleading disinformation and was ignored. The tweet, written Oct. 31, 2016 during Clinton’s failed presidential campaign, is a statement issued in response to a news report about an alleged secret server at Trump Tower that was being used to covertly communicate with Russia. “Computer scientists have apparently uncovered a covert server linking the Trump Organization to a Russian-based bank,” Clinton wrote in the tweet alongside the statement issued by one of her then-top aides, Jake Sullivan. A Twitter user tagged...