2014 was the year that the World Wide Web turned 25. It’s now an adult, as are the generation who grew up alongside it. We are digitally older, but are we happier and psychologically healthier for it? As befits a quarter-life existential crisis, we are beginning to wonder what is going on with us: What is the use of sites such as Facebook, Snapchat and Twitter doing to our social relationships and sense of self? How is ‘browsing’ and information ‘surfing’ rewiring our brains, and is it for good or for ill?