According to Nielsen’s latest research on smartphone usage, Facebook, YouTube, and Gmail apps are the most popular smartphone apps among Android owners aged 18 and older. According to the findings, Facebook’s popular app is the most active among Android owners aged 18-34, with an active reach of about 80%. Google’s YouTube app also gets heavy usage from Android smartphone owners, with 64% of users aged 18 -24 having used it in the past 30 days.