Can You Catch Narcissism?

Can too many selfies push you towards narcissism? Are we in the midst of an epidemic? Tim Samuels takes a selfie-obsessive to be wired up in a lab to see if his picture taking is becoming a danger and whether he actually qualifies as a narcissist. Experts also reveal the tell-tale signs of dating a narcissist. For extra content, videos and a regular newsletter go to www.bbc.co.uk/allhailkale