Crowned 'word of the year' by Oxford Dictionaries in 2013, the selfie has come a long way from its humble beginnings as a niche social media tag. But are selfies just a bit of harmless narcissistic fun, or is there a darker side?

Memes are part of the fabric of internet culture. But at a time when there’s such a disparity between reality and social media perfection, the subversion of the classic meme format reflects a shift in how people express themselves digitally. How do nihilist memes show the silver lining of sadness?

Whether you're a woman eating on the Tube, or a sleeping commuter, the combination of social media and smartphones mean that no public space is safe to do anything you wouldn't want caught on camera. Is it just a bit of harmless fun, or something a little more sinister?

Public shaming is back on the agenda. From fears of being photographed eating on the tube, to apps that erase pics from the night before – the spectre of public criticism looms large. Has social media revived this age-old mechanism of control? Or can shame be a force for positive change?