There are at least 7.22 billion consumer messaging app accounts worldwide on the 10 largest platforms, led by Facebook Messenger (1.10 bil.), WhatsApp (1.10 bil.), WeChat (1.10 bil.), Tencent QQ (0.91 bil.), Viber (0.81 bil.), Instagram (0.60 bil.), Tumblr (0.55 bil.), Line (0.40 bil.), Kik (0.33 bil.), and Twitter (0.32 bil.). Businesses can engage in customer service and commerce on these and other social networks with messaging apps including Sina Weibo, Telegram, Snapchat, Pinterest, Skype, and Slack using a form of artificial intelligence called a chatbot, which engages with consumers who...