4chan is that dumbass kid who releases bees into the classroom just to laugh at everyone who doesn't want to get stung.

If there's a backstory, it's probably something that everyone else would shrug off and move on with their lives, but for whatever reason, the sociopaths at 4chan cannot.

Something about 4chan /b/ inventing memes that then end up on tumblr unattributed.

(I don't know that any particular memes were named in this allegation.)