I think it is way more than the "ninth most popular website." I'm quite sure the Web would be a very different place if it hadn't existed. In fact, I would rank Wikipedia alongside the Web and perhaps the Internet. Not only did it establish that information about nearly everything would be available free and without commercial motivations (obviously, with tremendous caveats, but still far closer to those ideals than any of its contemporaries), it also provides an incredible corpus that is the basis of many machine learning approaches. With the excuses people make on a daily basis, there's no assurance something like Wikipedia would have happened the same way. And it continues to develop important projects. Separately, Wales doesn't deserve all the credit, but I just can't leave that the summary of "Wikipedia" is it's "almost as popular as Facebook."
