Just to add a few: when I think about Forum features/structure/culture, I often think of other sites that have similar-ish functions that I’ve appreciated and/or used, including:
Stack Exchange (my main experience is with Math Stack Exchange)
Quanta Magazine
Assorted blogs
For the wiki: Wikipedia (and other wikis, including stuff like TV tropes), Stanford Encyclopedia of Philosophy
We also sometimes think about e.g. Twitter
[Edited to add — happened to remember] Also Hacker News
Just to add a few: when I think about Forum features/structure/culture, I often think of other sites that have similar-ish functions that I’ve appreciated and/or used, including:
Stack Exchange (my main experience is with Math Stack Exchange)
Quanta Magazine
Assorted blogs
For the wiki: Wikipedia (and other wikis, including stuff like TV tropes), Stanford Encyclopedia of Philosophy
We also sometimes think about e.g. Twitter
[Edited to add — happened to remember] Also Hacker News