Younger consumers spend more time per week watching video on their desktop or laptop, as well as playing games via their console.
Consumers aged 14 and older access apps more frequently on smartphones than tablets, with social media the top app type on both devices.
In the battle among the social networks to attract new users, 2016 will be a banner year for Snapchat.
More than 9 in 10 US consumers aged 14 and older say they typically multitask while watching TV, up from about 8 in 10 just 3 years earlier.
Almost 8 in 10 Americans aged 12 and older currently use some form of social media, according to the latest annual Infinite Dial report [PDF] from Edison Research and Triton Digital.
This year, Americans will spend more than half of their social networking time on Facebook.
Mobile devices and other digital technologies continue to have a growing impact on retail, including in-store shopping.
When GfK MRI asked US smartphone users about what mobile apps they checked first thing in the morning on a typical weekday, two-thirds said they looked at text messages, and 63% checked email.
Instagram and Kik are the messaging applications that young teens are most apt to often use.
Some 58% of American adults consider themselves addicted to their phone, and that figure rises to 76% among Millennials.