Open this photo in gallery: Aubrey Cottle feels culpable for the role he believes that he and other members of Anonymous played in inadvertently helping Donald Trump become the President of the United States. Mr. Cottle at his Oshawa home on April 23.Fred Lum/The Globe and Mail More than two decades ago, a group of young, predominantly male internet users started congregating on an online forum called 4chan, where they circulated memes, co-ordinated pranks and orchestrated disinformation campaigns. A subset of them formed a loose collective that called itself Anonymous. But what began as “fun and high jinks” kicked off...