Though doubtless left and right use it, ‘virtue signalling’ is a reactionary catch-phrase. The context of Bartholomew’s ‘discovery’ of the term says much: he was researching a book denouncing the British welfare state. For Bartholomew, a virtue, rather, is a ‘sacrifice’ like ‘staying together for the sake of the children’, or it’s a charitable act like ‘delivering lunches to elderly neighbours’. It’s not political speech, certainly not online.