Remember that talk of Facebook testing its own virtual assistant? Well, it's real. The social network is trying out M, an artificial intelligence-powered Messenger assistant that can answer questions and complete tasks. You can ask it for advice on places to go, for instance, or have it make travel arrangements. Think of it as a Siri- or Cortana-like helper that exists solely in text chat. It should be less likely to make mistakes, though, as Facebook is quick to note that there are humans training and supervising the AI behind the scenes. And in case you're wondering, it only bases its conversations around Messenger -- it's not using your regular Facebook data to make decisions.