Millennials Are Always Within Reach

Americans under age 30 have a hugely disproportionate presence on messaging apps and social media sites. According to a new Pew report, nearly half of 18- to 29-year-old smartphone owners use messaging apps (like WhatsApp), more than 10 percentage points higher than the share of 30- to 49-year-olds that do the same. The difference is even starker when d…