The discussion on my neighbourhood WhatsApp group is usually spectacularly vanilla. Pot holes. Bin collections. Road works. But last weekend something interesting happened. A petition was shared in support of the UK introducing a law banning under-16s from social media, as has recently happened in Australia. It was met with a slew of heart emojis, as if the suggestion was obvious and uncontroversial. “This isn’t party political – it’s about protecting children,” the message read.