We've seen a move away from people sharing everything with everyone, like Facebook, to wanting a more personal, private form of communication," he said.
"Today's teens are digital natives, they've been using multiple screens to access the internet from very early ages, and unlike many people in their twenties and thirties, they are very aware of how visible they are online."
The report also found that nearly two thirds of teens are using their mobiles while watching TV – a practice known as 'second screening'.
This does not necessarily mean they are using their phones to interact with TV shows or sharing their opinions about shows. Mander said that very few of the motivations for second screening have anything to do with the content on the TV screen.
"Mostly people are doing other things – they're talking to friends, they're reading the news, they're searching for information," he said.
"It's not necessarily that second screening is supporting TV itself, it's that it's an additional activity as people are watching shows.