That’s a question my blind client asks me and it sounds simple but you can’t currently do this with Alexa. That’s because , I think, Amazon has been a publisher not an operating system. Whereas Google is an operating system. That’s my theory. #
But you can do it via IFTTT ( love that website!) and OK Google by turning on this fix.
https://ifttt.com/applets/479257p-post-to-facebook-by-voice
If you were a blind user you would need to have your screen reader on to make sure you know what you have written. No unwanted or rude messages can be sent unintentionally!
AccessAbility Solutions 