Facebook or Facebook (also known as Facebook for short) is a website of the world-social intercommunication system , which was established on February 4, 2004. It is possible to become a free member. It is owned by Facebook Inc. Users can add friends , send messages and update and exchange their personal information , while a user can join a city , workplace , school and region-based network. The website is named after a book provided by the university administration on the occasion of good acquaintance among the students at the beginning of the academic year.