Is there a program that will tell you if your post has been posted at a site - for confirmation that you haven’t been blocked? I could see having two Facebook accounts, for example, such that you post to one and check (using the other account) that your post showed up. That would be cumbersome, for sure.
They aren’t afraid to tell you that you’ve been blocked. They don’t hide it like Twitter and Instagram. You can see the screen shots at the source of Facebook stating on the account page that it’s been blocked from posting. So you can’t even post or wonder about it if they blocked you.