
A year later, when WIRED visits Facebook's cavernous new Menlo Park HQ in California, Messenger is up to 700 million actives, with more than a billion Android downloads - yet his team of 200 has taken what Marcus calls mere "baby steps" towards the ultimate ambition of building the company's next great global platform. When Marcus made the surprise jump to Facebook to run its messaging division in August 2014, its Messenger app had 300 million monthly active users. Beneath a yawning seven-metre-high Frank Gehry ceiling - its outer shell covered by a 3.5-hectare Mark Zuckerberg-devised giant rooftop park its pristine 40,000-square-metre interior decorated with posters imploring staff to "Move Fast And Break Things" and "Think Wrong" - David Marcus, a former president of PayPal, is calmly explaining to WIRED what he calls "one of the biggest opportunities in tech in the next ten years".
