I dreamt that people found out that tumblr posts had a secret hidden text field that you normally couldn't put anything into that was called a post's "wungle text", and it wasn't normally displayed in any way, but someone made a browser extension that allowed you to write and view a post's wungle by flipping it over like an index card. The user's picture and name and all that would be backwards, but the wungle post looked otherwise like a normal post, though empty unless the author had written something in there. It worked in reblogs too.
People were using it for jokes, and a bunch of seemingly boring and innocuous posts got really popular with funny wungle sides.
EDIT: the Wungle is real (sorta) check this out! https://www.tumblr.com/morphimus/711351716911644672/simple-step-by-step-guide-to-use-this-wungle
EDIT 2: Second part of this post in case you missed it: https://morphimus.tumblr.com/post/710837261845037056/it-looked-kinda-like-this-the-post-would-be-the
