Ah, Wikipedia. It's the greatest repository of knowledge the world has ever seen -- made possible through its crowdsourcing feature, which, as you surely know, allows just about anyone to become a Wiki-master. But as we learned from Spider-Man (or, as the Wikipedia page tells us, Winston Churchill), with great power comes great responsibility, so for every inaccurate, inappropriate, or opinionated wiki-page edit, there must be an equal and opposite revision to keep the Internet's Encyclopedia focused on the facts.
The Observer ran an insightful search on the platform itself to discover exactly which pages have endured the most edits as of September 8th, 2015. Unsurprisingly, after wading through the internal site administrative pages, the most active entries are some of the most controversial topics on the Internet. (You'll notice that several entries are for a subject's Talk Page. These are essentially comment boards for editors to "provide space for editors to discuss changes to its associated article or project page." If you deviate from the factual accuracy of the page, you're booted -- that's right, even Wikipedia comment sections have issues with trolls.)