Probably the second biggest culprit. The idea that I could pickup my phone and check to see if any of my friends are doing something or if I missed anything. The advent of "spams" is a big contributor to this too, stories aren't just shorter/less frictioned post, they have become ways of broadcasting, to a few which always becomes increasingly many, everything a person is up to, doing, going through, thinking, etc. It's strange, really, and hard to describe why I am always gravitated toward checking what my friends are doing, what's going on, admittedly the fatigue gets to me past certain points, for certain people.