Besides showing that people spend a good chunk of time on Facebook, the data underscores the importance of a mobile strategy for the social network's business success. Facebook currently makes little revenue from its mobile app the app doesn't include ads, and only started to include "sponsored posts" in users' news feeds last March.
Facebook admitted its mobile struggles in its recent IPO documents. "If users increasingly access mobile products as a substitute for access through personal computers, and if we are unable to successfully implement monetization strategies for our mobile users," the company writes in its filing documents, "our financial performance and ability to grow revenue would be negatively affected."