3. Free knowledge for everyone.
Until the 21st century, people got most of the information from other people or text sources, for example encyclopedias. But everything has changed after invention of Wikipedia in 2001. Hard to imagine modern life without using Wikipedia, because it is most easy way to find information. Originally, Wikipedia was created as supplement to the free Nupedia encyclopedia, written by experts as an additional source of draft articles and ideas. But Wikipedia quickly bypassed Nupedia, becoming a big international project. Today the English Wikipedia contains over 6,000,000 articles , it is also one of the most popular websites in the world. The main advantage and at the same time biggest drawback of Wikipedia, is the fact that anyone can edit any article. Wikipedia can be free because of it, because you don't have to spend a lot of money to hire editors, who would check articles. Also thanks to the large number of editors, information about anything appears very quickly. But that means, th...