There are some evil geniuses behind the marketing for Avengers: Age of Ultron. This past Wednesday, they posted the following promoted tweet: “It’s go time, Marvelites: Tweet using #AvengersAssemble to unite & unlock an epic new #Avengers #AgeOfUltron Trailer!” And, on cue, thousands of faithful Marvelites flooded the website with what amounted to free publicity. […]