I got to wondering about backdating a Facebook page, I’m now pondering whether you could just re-purpose one.
I imagine so.
Both can be done. It used to be you can just change your system clock to trick it to display earlier posting times but re-purposing a page is also a possibility. I'm going to see if I can find a link to that page again (Facebook deleted it) and see if there is anything on Archive.org. I did check Google cache earlier and it didn't have anything which is odd because Google indexes the heck out of facebook.