Facebook says half the world’s estimated three billion internet users access the social networking site at least once a month. <br /><br /> The 13 percent growth in users over the the second quarter helped drive up revenue by 39 percent year-on-year to 4.04 billion dollars, 3.68 billion euros. <br /><br /> The company says that in the US people are now spending more than one out of every five minutes of their smartphone use on Facebook. <br /><br /> Mobile advertising revenue accounted for more than 75 percent of total revenue, the biggest single contributor. <br /><br /> Facebook shares have risen 24 percent over the past year.
