When I submitted http://www.facebook.com, it redirected me back to the previous outage link because the URL is the same: https://news.ycombinator.com/item?id=7914905
I added a random URL string to have HN recognize this as a new entry. Perhaps it's a good idea to allow re-posting the same link for certain URLs so that "XYZ is down/having issues" type posts aren't deemed as duplicates?