My library system recently set up an intranet for in-house communication. The home page has a link to a wiki intended for posts by our system's employees who are at conventions or conferences. It's set up on a commercial site (let's call it Tom Sawyer's site) and boy, is it a pain in the neck.
While it's called a wiki, I don't see it as that different from a blog -- individuals are posting about presentations, and others can respond. I hadn't realized just how great this site is until I used Tom Sawyer's site. My single biggest problem with that site is that you cannot edit a post after the fact. So there are all my typos, plus, rather embarrassingly, the wrong name for a speaker, out for public view for all time and eternity. I had to respond to my own post to announce the speaker error.
I spent a lot of time searching for help from Tom Sawyer to see if there is, in fact, a way to edit a post. I managed to come up with a huge number of posts on another part of the site itself, not my system's part, commenting on that lack. A number of them mentioned Blogspot as one site having that feature.
I now recognize that I am quite spoiled -- and I'm very happy that's the case.