Microsoft has created a strange robot that can converse with people on Twitter. The robot, apparently named Tay, is artificially intelligent and speaks with people who send messages to it. It appears to be based on Microsoft's machine learning work and claims that it will get better as it is used. The account, found at @TayandYou, responds automatically to all tweets. But it remains a complete mystery why Microsoft created the account – which has been verified by Twitter – and what it plans to do with it.