The chatbot revolution

Chatbot is a computer program designed to simulate conversation with human users, especially over the Internet. Among Facebook's F8 announcements, there was one about chatbots on messenger. Simply put: as a part of the newly announced messenger platform, Facebook has made it easy to integrate a chatbot as a part of the business page service suite. A user with a question can ask it freely (not in a code format) over Facebook's messenger and get an answer in natural language. What are the uses for chatbots?