I think it's a reference to 196 which started on Reddit. The community has one rule, to post before leaving.
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This is due to the community over at /c/196, formally /r/196. From Urban Dictonary:
"A subreddit that gained popularity due to only having one rule, which is to post before leaving. The sub started after it's predecessor, r/195, was shut down by the moderators."
Every post is titled with 'rule' in a similar vein to me_irl or the like (which has a similar gimmick). They're sort of free for all communities, usually meme focused.
The "rule" is that you have to post something before you leave. It's a community full of random shitposts and somehow the people there can make sense of it.
Edit: to clarify, this rule applies to the "196" community only. 195 196 or I guess sometimes 197?
197 is a community with one rule: if you go there, you have to upload an image before leaving. People usually put "rule" in the title of those.
I believe you are referring to 195 and 196 meme subs with that in the title, no? Apparently the "rule" they're referring to is the one specifically for those subs that require you to post some kind of lousy meme of your own making before leaving that community. Just learned about this myself. Most of them are indeed terrible.
You might be looking at the 196/195 (https://lemmy.blahaj.zone/c/196) community where the one rule is: You must post before you leave. With how the rule works it generates a lot of posts that put rule in the title.
It has to do with the subreddit r/196 where they have a "rule" of posting something if you visit. They migrated to !196@blahaj.lemmy.zone and the subreddit is closed to new posts.
That’s the 195 community, specifically. They’re pretty active.
RULE 1: IF YOU VISIT THIS COMMUNITY, YOU MUST POST BEFORE LEAVING!!
I think the gist is you post whatever random meme you have handy. There’s no rhyme or reason to it.
From my even more geriatric gen-x understanding: I'm guessing you are referring to /c/196 posts. Which has a single rule of having to post something if they visit the community. So people are titling "rule" because they are posting to follow the rule.
I ended up filtering that community out, because it was so much random noise when I'm trying to look at "all"