I have been running a large MediaWiki powered website for over three years now. In my opinion, the most important aspect about a wiki is that everyone can contribute with ease. That’s why when I set up the website, I wanted to make sure that anonymous users could contribute. This worked great for roughly a year, with an occasional spam message and some vandalism, but nothing that couldn’t be managed. I found that it was possible to keep the spam at bay with some basic tweaks ad plugins for MediaWiki. This system worked great until again roughly a year later. Suddenly a massive amount of SEO bots were flooding the website, posting an unmanageable amount of spam. It was very hard to find a good solution for this problem, even a commercial one, as MediaWiki isn’t that broadly supported, not like WordPress or Drupal for example. I ended up stumbling upon CleanTalk.