To add to that, on Reddit, there was originally /r/CredibleDefense. This was intended to be serious discussion about military topics from people who knew what they were talking about making supportable statements. Like, people cited sources and such. It didn’t always actually meet that bar, but the idea was to keep the level of nonsense low.

That’s kind of a high bar, and sometimes people don’t want to rigorously examine everything and have more-casual discussion, so then /r/LessCredibleDefence showed up.

/r/NonCredibleDefense was developed as the logical extension of this, becoming less…serious…and consisted of people posting memes and often making completely-inaccurate statements for humorous effect.

NCD was more-approachable than the others, and so a lot of people wound up showing up there.

I was not around when they formed, but did show up later, and enjoyed content on all of them.

There is no CredibleDefense or LessCredibleDefense on the Threadiverse, currently. [email protected] is the sole representative (well, maybe [email protected] will be something like that, but it doesn’t quite deal with the same stuff). I tend to vigorously disregard the rule about not posting serious material on NCD, as a result, but it’s got plenty of memes and people making jokes.