Too many buttons spoil the bot

GUEST: Dashbot.io, a tool for analyzing bots, recently surpassed 70 million messages processed. One of the questions that comes up often for developers is buttons. What performs better: free-form text input or button-driven interfaces?
We took a look at the data across Facebook bots on our platform for the past three months. Keep in mind this is looking across all bots, not segmenting based on industry vertical or specific use case. At a high level, what we found is that a mixture of b