Facebook said the number of people who use it at least monthly grew 13% to 1.49 billion in the three months to the end of June. The number is equal to half of the estimated three billion people who use the internet worldwide. Of those users, it said well over half, 65%, were now accessing Facebook daily. The rise in monthly active users helped drive second quarter revenue up 39% year-on-year to $4.04bn. Mobile advertising revenue was the biggest factor, accounting for more than three quarters of the total. In the US, the company said people were now spending more than one out of every five minutes on their smartphones on Facebook.