Facebook's Messenger platform plays home to a fast-growing number of chatbots, booming since launch over the last two-and-a-half years. With over 1.3 billion people on the platform, it is a clear focal point for business, charities and educational institutions to engage with. But, what's the word from the chat box as more brands and developers try to get attention on the platform? At its F8 event a few months back, Facebook announced it had crossed the 300,000 chatbot barrier on the Messenger platform. That's despite the brief pause as the company checked through its security and privacy features, but now new bots are being added at pace, at a 200% annual growth rate.