By BBC Radio 5 Live
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