Facebook was created in 2004 by Mark Zuckerberg as a social networking site for Harvard students. It quickly expanded to other universities and reached 1 million users within a year. By 2006, Facebook accepted any users over age 13. Today it has over 90 million active users and has proven effective for marketing. Facebook has continued evolving to make sharing information easier and establish real user identities. Mark Zuckerberg says Facebook is touching on trends in how communication is changing and how the company can adapt.