Facebook: finally making mobile work This is not to pretend that all is rosy in the Facebook garden: a Piper Jaffray survey found that just one third of teenagers said Facebook was their most important social network. But a look at the network's own users reveals a number of key facts: while 70pc of monthly active users visit via mobile, up 51pc year-on-year, and one in five, 219m, are mobile only, Facebook has more than a million active advertisers, and they are increasingly content with the company's mobile advertising proposition. It's worth asking how Facebook has engineered such a rapid turnaround on its own platform: for a start, internally, Zuckerberg turned off Facebook.com for a week - he forced his own staff to use the mobile apps. Little wonder that both iPhone and Android users in particular suddenly found that apps were substantially improved. "If the people that make them have to live with them," a Facebook source said, "then improvement was inevitable." So the company has adapted to include a mobile engineering component for every team, meaning that each product conforms to the site's aspiration of mobile first and mobile best. It is, after all, how most new users will increasingly encounter any given service. As Cory Bergman, the general manager of NBC's Breaking News put it, "Facebook's mobile presence is greater than every media company's mobile footprint combined. Zuckerberg says his goal is to make it the best personalized newspaper on the planet, and with 819 million mobile monthly active users and 1 million advertisers, he's off to a good start. The site is increasingly the lens through which not only its users see their friends, but also through which whole categories of web browsers see the entire internet. Facebook's earnings per share of 13 cents on revenue of $1.81 billion beat analysts" expectations of 14 cents on $1.62 billion. The key piece of information the company said it had learnt was that, whether on mobile or on desktop, "News Feed ads work." Chief Financial Officer David Ebersman claimed "They're really creating compelling returns for our advertisers." And video adverts are coming next: "Facebook's massive audience should be irresistible to brand advertisers as the company preps to launch 15-second video ads, which could be Facebook's next billion-dollar business," analysts at Jefferies & Co wrote in a note. Facebook's daily active users are now up to 699 million, up 27pc year on year. Each month 1.15 billion users log on, up 21 percent increase year on year. But on mobile there are 819 million monthly active users, up 51pc year over year. "We've made good progress growing our community, deepening engagement and delivering strong financial results, especially on mobile," claimed Zuckerberg. While that may sound like hyperbole, for once a company's chief executive may yet be reflecting the reality: Facebook knows it must get to grips with mobile. And where Google is struggling, despite building the Android operating system that now powers most phones, Facebook is thriving. It may yet even be worth what it was when it floated.