it feels to me like in public writing there is an axis of ownership, personal writing vs. collaborative writing, and there's also an axis of completion, from publishing things that are done and no longer changed, to publishing things that are updated and amended and try to reflect your latest thoughts on something.

personal blogs are a thing
collaborative wikis are a thing
collaborative blogs are... somewhat a thing?
personal wikis are... much more rarely a thing?

but I think I want a personal wiki