The Twitter debacle doesn't seem entirely relevant here Twitter's API was being used to build apps that replicated and competed with Twitter's own functionalit

The Twitter debacle doesn't seem entirely relevant here Twitter's API was being used to build apps that replicated and competed with Twitter's own functionality and created a conflict of interest between Twitter and 3rd party developers There isn't much else you can do with this Messenger API other than to create channels of communication between businesses and their existing and potential customers. Those businesses likely wouldn't know how to make this themselves, so you could make a bit of money there. This wouldn't compete with Facebook, but rather ties both customers and businesses tighter to Facebook, making FB more valuable to those businesses and and perhaps encourage them to spend more on promoting user engagement. There'd be no reason Facebook would want to shut you down. They certainly don't want to get into the nitty gritty business of connecting chat messages to all the various ways different businesses could function.