Is virtue signalling a vice?

Evolution has taught us to beware of fakes and hypocrites. Most people love showing off their good deeds on social media. Naturally, we tend to look down on this, but that's often to win political points. So, instead, Tadeg Quillien, a postdoctoral researcher in evolutionary biology and computational cognitive science at the University of Edinburgh, looks at how mathematical models can reveal when virtue signalling adds up.