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Keywords application book brand browser business click communication computer concept connect connected device digital email face facebook friends graphics homepage icon internet like login mail media mobile monitor network networking online page profile public service sign site social surfing symbol tech technology timeline traffic users web website world www Caption 13154947 - bucharest, romania - march 28, 2012: facebook logo is displayed on a mobile phone screen. facebook is a social networking service launched in february 2004, having more than 845 million active users.