Over the past decade, Wikipedia has grown to become the largest and most popular general reference work on the Internet, ranking sixth globally among all websites on Alexa and having an estimated 365 million readers worldwide. According to Wikipedia, it currently contains 21 million articles (over 3.9 million in English alone) that are written collaboratively by volunteers around the world. As of January 2012, there are editions of Wikipedia in 283 languages. Undoubtedly, Wikipedia has become one of the most successful wiki and the most visited encyclopedia online.
Also, Wikipedia has grown to be the number one source for students. Students use Wikipedia more than libraries. Thanks to Jen Rhee who shared with me this outstanding infographic about how Wikipedia. This infographic highlights how Wikipedia has revolutionized research and how it has become a reliable fountain of knowledge.