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Several people shared a Facebook link to a temporary site I was running. I will be taking this site offline soon as I have the permanent one in place. Is there any way to get Facebook to update the links in these posts to the new address?
Nope. As far as I know, Facebook doesn't do anything with an "HTTP 301 - Moved permanently" error code (unlike Google Search).
If you can't leave a redirect behind, I'm afraid you're going to have to rely on the people who posted those links changing them.
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