I'd like to know if there's a way, in any language, to know when a friend is writing a message through Facebook API or others.
My target is to build ssomething to be notified when a friend is writing me a message (as it works on snapchat). If there's already a way/an app to have this please tell me. Thank you!
Friend permissions are gone and the Chat API is deprecated, there is no way to do this with any language.