There would soon follow not just an attentional habit but a new social norm, that of never parting from one's device; of standing and staring at it, as if paralyzed, as the world goes by; of not looking up in the presence of others, except when the urge to take a picture erupts at the strangest moment—autre tech, autre moeurs: it is probably the thing a visitor from a previous century would find the weirdest.

Tim Wu, The Attention Merchants, loc. 1039