Facebook is first social network to get 1bn users It is the first social network to hit the billion-member threshold, and has twice the users of its nearest competitor, the microblogging site Twitter. However, the milestone had little impact on Facebook's ailing share price. The social network has struggled to regain its footing after its disastrous $104bn (£64bn) flotation in May, and yesterday saw its shares edge up just 10 cents to $21.93 - little over half their value at Facebook's initial public offering. Mr Zuckerberg, who founded the company in 2004 from his Harvard University dorm room, said: "Helping a billion people connect is amazing, humbling and by far the thing I am most proud of in my life." He added that his ultimate goal is to have the world's entire population of nearly 7bn people on the social network. Meanwhile, Zynga, the online gaming company that generates 14pc of Facebook's revenues, last night cut its annual forecast. The Californian company, which floated last year, also warned it will break even at best in the third quarter as players spend less money on its games and new titles are delayed. Shares in Zynga tumbled 13pc in late trading in New York.