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.
One theory about how the whole Roswell UFO/aliens thing as government gaslighting.
This stuff happened during the height of the cold war when the Soviet Union was 100% looking for anything they could get on the USA’s secret programs. It’s easy to poison a source of actual intel if you send a few guys in suits and sunglasses to ask vague, leading questions to steer them towards “little green men.”
For example https://en.wikipedia.org/wiki/Remote_viewing