One in every five minutes spent on a mobile phone is spent on Facebook

One out of every five minutes people spend on mobile phones in the US is spent on Facebook, the social network revealed, while announcing second-quarter results.

The company also says users spend an average of 46 minutes a day on Facebook's apps, excluding the heavily popular messaging service WhatsApp, with people making 1.5bn searches a day on the site. It has also registered more than two trillion posts on the site.

Led by founder Mark Zuckerberg, the figures announced by Facebook shows its growth in popularity, with 1.49 billion monthly active users as of June 30, which is 13% up from a year earlier.

Of these 1.49 billion users, 1.31 billion accessed the site through mobile devices - that's also a 23% rise.

"Mobile is the engine of our revenue growth," said David Wehner, chief financial officer of Facebook.

The social networks revenue also jumped to $4.04 billion in the three months which ended June 30, from $2.91 billion it posted in the same period last year. This would have been $330m higher had it not been for a strong dollar, Wehner added.