Oddly I tried some old links and the worked.
But I tried to post a link to a facebook page and it ended up as a 404 with a ;CID ending
Test:
https://www.facebook.com/hickoryskicenterSo it works here.
I think it has something to do with embedding.
I've always seen those pages in my google analytics, and didn't like that they were duplicates, but never saw any link issues in the past.
HTTPS Please!