Here’s some material you might find helpful:
This is a lovely article by novelist Nicholson Baker that was published in the New York Review of Books in 2008. It does a great job of describing how Wikipedia works. Here’s another good article on Wikipedia, written by Dan Pink for Wired magazine back in 2005. And here’s a 2011 piece from the Guardian by British historian Timothy Garton Ash.
Here’s a column I wrote for the Guardian on Wikipedia’s 10th anniversary, on why we need to preserve the Internet as free and open.