Trump campaign ran this Facebook ad that seems to imply he won the election (since no new ads allowed starting today, advertisers had to have at least 1 impression to be able to run later). Ads claiming premature victory are supposed to be against FB rules
Update on that Trump $FB ad: Spox said the “President Trump is STILL your President” ads were allowed, since regardless of the election outcome, the president will continue in his role until January 20.