Social networking sites can provide a "constant reassurance – that you are listened to, recognised, and important". Greenfield continued. This was coupled with a distancing from the stress of face-to-face, real-life conversation, which were "far more perilous … occur in real time, with no opportunity to think up clever or witty responses" and "require a sensitivity to voice tone, body language and perhaps even to pheromones, those sneaky molecules that we release and which others smell subconsciously".