It's against my nature (being a librarian!) to put anything out of order, but thought I'd skip a few "things" to do Wikis, which I know a bit about, and fiddle with the earlier things later.
I use Wikipedia quite a lot to look things up; I don't think I would risk editing anything, but found the history and discussion tabs interesting - I'd never taken much notice of them before. We have a library wiki, so I thought I'd check the missing books list and found one book on the shelf, so edited the list, and also made a few minor changes elsewhere. I've also turned my blog blue (was a bit tired of the pink.)