AlwaysOn: Broadband Behavior: I Want My Info Now!:

“Tenure online has a profound impact on behavior. The longer you’re online, the more your behavior changes, the more you adapt, the more likely you are to be in an always-on environment and the more likely that will accelerate the change in your behavior. According to a UCLA study that AOL participated in, 50% of online users in the United States have been online for four years or more; 27% six years or more. That is a line of demarcation. Behavior starts to really change after four years. Our research says that tenure and an always-on environment go hand in hand. The environment mirrors the tenure effect, and they both affect user behavior.