American Facebook users spend around 40 minutes a day using the service

"American Facebook users spend way more time on the social network than exercising. Mark Zuckerberg said today on Facebook’s Q2 earnings call that “people on Facebook in the US spend around 40 minutes each day using our service”, while the CDC recommends Americans exercise 21 minutes a day but only 20% of people meet that goal.
Zuckerberg said that the 40 minutes a day on Facebook account for one in five minutes spent on mobile in the US. Yet Facebook’s CEO sees plenty of room to grow, as he said “overall people in the US spend nine hours per day engaging with digital media with TV, phones and computers” and called this a “Big opportunity to improve the way people can share”. With 204 million monthly users on Facebook in the US and Canada, it could earn a lot of money by inching up that engagement time per day."

Source:  TechCrunch, 23rd July 2014