Slightly more than two-thirds of American adults (68%) now own a smartphone, representing a rapid rise from about half that proportion (35%) in mid-2011.
At the most basic level, boomers simply do not use smartphones as often as younger people do.
Facebook remains the most popular social platform, used by 72% of connected adults.
Roughly half of US smartphone owners say they check their phone a few times an hour or every few minutes .
The overall Internet adoption rate among US adults stands at 84% this year as it has since 2013, and is up from 52% in 2000.
In 2015, 67% of mother Facebook users logged on to the social network via mobile phone, up from 60% in 2014 and just 45% in 2013.
US mother Facebookers studied checked the social network 7.4 times a day on average, vs. 5.9 times for total users.
More than seven in 10 women said they shared online videos on Facebook.
This year, 204.2 million people in the US will watch digital video content via any device at least monthly, representing 78.6% of internet users and 63.5% of the population.
Males were the driving force behind mobile-only newspaper readership gains.