Here is an interesting article about the psychological state that we "go" to when we are "on" Facebook. The answer, it appears, is the "machine zone" - a place that for many of us has usurped the actual places we inhabit.
What is the machine zone? It's a rhythm. It's a response to a fine-tuned feedback loop. It's a powerful space-time distortion. You hit a button. Something happens. You hit it again. Something similar, but not exactly the same happens. Maybe you win, maybe you don't. Repeat. Repeat. Repeat. Repeat. Repeat. It's the pleasure of the repeat, the security of the loop.
"Everything else falls away," Schüll says to Mars. "A sense of monetary value, time, space, even a sense of self is annihilated in the extreme form of this zone that you enter."