Messenger (legacy)
Due to new limitations by Meta, it is currently impossible to add a new Messenger channel from CSML Studio.
Messenger is one of the most popular chat platforms, with over 1.3B users worldwide. It is also one of the platforms that democratized the use of chatbots. It has a pretty broad set of APIs and allows for some very rich message templates, which gives it a nice user experience. If you are looking to build a publicly-accessible chatbot, Messenger is definitely a solution to look at!
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