tumblr (stylized spelling without the "e") is/was a blogging site that was extremely popular with leftwingers of a particularly looney bent. while there are/were people of all viewpoints on the platform, for some reason, it was a real magnet for people who really wanted you to know how much of a victim they were.

Besides trans-everything, such ideas as headmates, otherkin, and many others developed and were extremely popular there. the community at least was known for being very much

(I'd go into it, but this video is a small sampling of the more insane things that occurred on the platform. warning; the guy who originally made the videos collected here is very much toward mocking everything, so the most extreme posts will be highlighted)

as far as I know the site still exists, but their numbers dropped off a cliff when they decided to ban porn a few years ago.