nothing when you’re sat around, face in your phone, not communicating to one sat beside you like a spare wheel, talking to you and you can’t take your face out of your phone as I’m trying to engage you in conversation about what we ought to do about this and that, or tell you about my day and you glance up occasionally and nod with a “huh, huh” then stick your face in your phone. I bet if I sent you a text or messaged you on FB you’d respond with more. Death of conversation.