It's kinda instance related but I couldn't resist..
@stux reminds me of Oekaki boards.
@carbontwelve Ohh I don't know that one
@stux it's a Japanese word that means to doodle/draw.
In the early 00's there where dozens of "Oekaki board" websites where people could draw in the browser and post to the website.
A general-purpose Mastodon server with a 1000 character limit.