Satisfying your skin hunger requires you to have meaningful physical contact with another person, and failing to observe your need for human touch can have profound emotional (and physical) consequences.

If you took a paper and pencil and stencilled the outline of the average person's online presence—like a modern day Vitruvian man—you could sketch out a web of stretching connections, too numerous to count. Millions of fibre optic cables connect us to our social networks: friends, followers, email acquaintances, even lurkers. So why do we feel more isolated than ever before? Could it have something to do with the fact that none of these connections involve human touch?