I’ll go first: r/kitty. One of the hundred grillion cat subs back on Reddit, the culture in this one was you posted a cat picture, and the only word allowed in the title or in any comments or replies was “Kitty.”
Someone is using that subreddit for covert communications, I just know it. Either on the level of “if u/PM_me_your_nostrils posts an orange cat, we attack at dawn!” or there’s some steganography going on with the pictures, but that subreddit was too stupid to be as active as it was.
I swear I remember flat earth being about questioning science and coming to conclusions yourself… As it’s a pretty simple thing to figure out…but I can’t find any information and no one has even mentioned it even starting as something not crazy…
Then somehow flat earthers arrived at designing actual good experiments which demonstrated the earth is indeed round and then rejecting the data they themselves collected.