Mark Zuckerberg, 23, founded Facebook while he was studying psychology at Harvard University . Majoring in computer programming, Mr Zuckerberg developed a number of social-networking websites for fellow students, including Coursematch, which allowed the users to view people taking their degree, and Facemash,where you could rate people’s attractiveness. In February 2004 Mr Zuckerberg launched “The Facebook”, as it was the original name taken from the sheets of paper distributed to freshmen, profiling students and staff. Within 24 hours, 1,200 Harvard students had signed up, and after one month, over half of the undergraduate population had a profile. As of September 2006, the network was extended beyond educational institutions to anyone with a registered email address and over the age of 13. According to Facebook’s Press Room, the social networking site currently has over 400 million active users The site remains free to join, and makes a profit through advertising revenue. Yahoo and Google are among companies which have expressed interest in a buy-out, with huge figures of around $2bn (£975m) being discussed. However, Mr Zuckerberg has so far refused to sell Facebook.