The idea of "tag wikis" that I've always had has been, more or less, just a quick definition of terms, perhaps with a distinction made between the tag under discussion and another similarly named tag with distinct usage.
Mostly there's no reason I've seen for having tag wikis beyond just a usage description, which can show up in the "tag wiki excerpt" just as well.
However, a passage in the description of "trusted user" privileges caught my attention (emphasis added):
What are tag wikis?
Tag wikis are a general introduction to a topic defined by that tag. They're a place to consolidate and form a sub-community around a tag. They contain, among other things, frequently asked questions in the tag, top users in the tag, and best recent answers in the tag.
This doesn't square at all with the idea I had of tag wikis as I described above.
Then I realized that on Stack Overflow, where the big wide world of programming is mushed all together on one site, such a thing would be vitally necessary. Heck, there are a lot of tags on SO that have been the subject of (failed) new site proposals on Area 51!
The disparity of topics available on SO is something like if:
- outdoors.stackexchange.com (because it includes boats, climbing, swimming and hiking), and
were all combined into a single "transportation" stack exchange.
So sub-communities are probably much more of a "thing" on SO than elsewhere.
- Do we actually have any tag wikis on this site that operate as described in the quoted passage above?
- Do we really have sub-communities on U&L? (It seems to me like we really just have one big community, mostly consisting of people who occasionally pop into chat, as mentioned here.)
- Are there any areas where we would benefit from having a sub-community as described above? (If there weren't an "ask Ubuntu" site already, Ubuntu would be a good candidate.)
And another side question that's really off-topic for this site: does anyone know how to find, on SO, which tags really are the basis for communities versus those tags that are just used for question categorization?