Which leads to a general theory, reinforced by informal observation of hipsters with iPads in coffee shops: a tablet is, crucially, a more shareable computer. A laptop, with its fragile hinge-ware and space-gobbling keyboard, is just not comfy to share. A tablet is easier to bring to the café easier to hand across the table or along the sofa, easier to seize in the heat of the moment, easier to hold up in triumph, easier to set aside when you need to meet someone's eyes.
