Mobile analytics firm Flurrys latest in-depth study into mobile device use in the US shows that even over the past three months, the average length of time per day spent browsing, calling, or using apps via a smartphone has jumped another four minutes to a massive two hours and 42 minutes. Facebook (including Instagram use) is a distant second, accounting for 17 percent of time spent, while social messaging, i.e., using WhatsApp or SnapChat or Viber for example, takes up another 9.5 percent. At 4 percent, YouTube accounts for half of all entertainment app use (with all others accounting for another 4%), and is as popular as all apps defined as aiding productivity (4%). However, despite its ability to create trends, cause outrage or act as a foundation for building news stories, smartphone users devote just 1.5 percent of their time — less than three minutes a day — to Twitter, half as much as they devote to news apps.