The research into device use found that 63 per cent of people use two or more devices every day, while more than a fifth (21 per cent) use three or more devices a day.
The study surveyed 2,018 adults. It was commissioned by Facebook and carried out by market research company GfK between November and December 2013.
It found that the more devices people own, the more they move between them to complete tasks.
Of people who own two devices, 54 per cent switch between them mid-activity, rising to 73 per cent of people with three devices.
Mark Bulling, the EMEA measurement lead for Facebook, said switching between devices was now "commonplace".
Bulling said: "From our own personal lives, we know that five years ago we were just using laptops to browse the web. But we can see from this research that this behaviour is commonplace. We’re not just talking about early tech adopters.
"Businesses need to consider how any consumer’s going to interact with your brand between those devices."
The research revealed smartphones are considered the "go-to" device. Of adults who owned one, 77 per cent use it while they are "out and about", meaning physically moving around.
It also found that using email and Facebook were the activities most likely to be carried out across more than one device, out of a list of other sites and activities."