i would skip the middle part, that can come across bad, as a threat, or a promise to make comments that could possibly be seen by him as slanderous. but do send a hard copy, signed, with specific dates and mention when you started the work, that you did it on short notice and would appreciate him making the same sort of professional attention to your payment as you did for his needs when he was pressed for time and asked you for your professional services.
if it comes to it, the next letter after that should be more strong, with mention that you are pursuing legal advice on the matter and will follow up if no news within 5 working days (or something like that).
No, I wouldn't comment on his facebook page. I'd write him a snail mail letter, in which you advise him that he has had reasonable time to pay for the file he got from you, and that if you do not receive the prompt payment to which he agreed, you will contact the boards of groups in the circle in which he conducts, and advise them of his attitudes towards you, and that following that, you are contemplating appropriate legal action.
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