Is there a way to control the user prompt (defaults to "Say something about this...") in a facebook feed dialog using the Javascript SDK?
I don't want to prefill the content for the user, I just want to give them a bit better direction ("Let your friends know lorem ipsum dolor sit amet...").
It appears that there is a property user_message_prompt but it doesn't seem to work. I assume it's been deprecated.
Sorry to post such a general question here - I find FB's API documentation to not always be helpful (no offense to FB folks on here, who are super helpful!).
I am afraid this is not possible. Why not communicate your message before initiating the dialog along with the call to action button?