Over 27 million for English Wikipedia at last count in 2015
Users on Wikipedia share facts and information on many topics.
Users AreJimmy Wales and Larry Sanger founded Wikipedia, but it is the users who write the articles and edit them.
The articles on Wikipedia are written by users of the site.
Yes. Wikipedia is an example of a wiki, a site that can be edited by its users.
Wikipedia is 100% free for use.
Wikipedia is ran on funds donated by regular users. There is a donate link in the left menu of every wikipedia site.
Wikipedia
I have also seen that wikipedia ranks on the first page of google from different keyword phrases. The reason behind this is the quality of the content which wikipedia provide. Wikipedia always shows unique and useful content to its users and the domain authority of wikipedia is very good that's why wikipedia rank on first page of google for so many searches.
http://en.wikipedia.org/wiki/Wikipedia:Contact_us
A user creates the page and other users contribute to it.
Yes, Wikipedia is similar to WikiAnswers in the fact that there are users who can edit anything, and that they both use the Wiki format.
Wikipedia is full of facts written by many many many users. Blogs are written by 1-5 people that the author of the post gave permission to do. Blogs you can trust because Wikipedia may have information that may not be true, blogs might, but it is a lower chance.