It's been just over a year since Microsoft's Tay shuffled off this digital coil in a swirl of racist, sexist and homophobic vitriol. One of the things I liked about Microsoft's approach was to not scrap the idea of an AI-powered chatbot but to take the experience of Tay and learn from it. So, a little over a year after Tay vanished, we welcome Zo. But like all younger siblings, she may have picked up a few bad habits from her older sister.