Wikiscanner is a site that allows you to find out who has been editing Wikipedia. For kicks I looked at what people coming from The Washington Post ip addresses are editing. The results page is here. It is kind of interesting. Either people who work for the Post are tasked with going into Wikipedia and fixing spelling errors and so on, or a lot of their employees are doing it just for fun. Of course they could be doing it after work hours, or at home using Post laptops I guess.
It might be they research articles here and while they are there they fix things, such as the spelling of "minuscule" in an article on Anilox.