A judge on Monday dismissed a blockbuster antitrust suit against Facebook filed last year by federal and state regulators, saying the lawsuit failed to "plausibly" establish that the social network had created a monopoly. Judge James Boasberg of the US District Court of Washington DC dismissed the case filed in December by the Federal Trade Commission and more than 40 states, which could have rolled back Facebook's acquisition of Instagram and the messaging platform WhatsApp. The lawsuit "failed to plead enough facts to plausibly establish a necessary element... that Facebook has monopoly power in the market for personal social networking services," the judge said in a 53-page opinion, while allowing authorities the opportunity to refile the case with revisions. bur-rl/bfm