Social media provide a strange playground for a psychologist. You get to watch people interacting, like a fly on the wall, much less intrusively than in real life. Each platform has its idiosyncrasies. Facebook ‘friendships’ mostly follow real-life ones, whilst Twitter and Reddit are dominated by relationships that exist only in cyberspace. Over the last couple of years, people have become more and more worried that these media may be causing or exacerbating a social divide. For example, in the political sphere, the centre-right and centre-left voices are being drowned out by the far-left and far-right. Numerous scholars and commentators have blamed social media. There might be some truth to…