I joined wikipedia to rewrite sentences with awkward "however" clauses tacked on. So far, I have spent more time doing other things.
I found another thing I like to take care of: editing pages so sections contain discrete information. For example, when an introduction has 5 paragraphs of history on a computing topic and tons of implementation details or usage examples, I like to cut them out and put them under their own subheadings. Information needs to be organized to be useful!
It's been a couple years. I haven't made a lot of changes but looking back on this I'm surprised how accurate my self-knowledge was, because I continue to be frustrated by wiki articles that are composed of random sentences that aren't related to each other, and how so many sentences seem to be debating themselves by throwing a 'however' clause on. (jan 2016)