The first problem was about how Facebook fit into its users’ days. While people spent an average of about 45 minutes per day on Facebook, known internally as the “big blue app,” they were doing so in short sessions—an average of less than 90 seconds per sitting, according to an internal data analysis. They were not lounging with Facebook on their couches so much as they were checking it at bus stops, in line for coffee, and on toilet seats.
