Everyone has already taken the "incel" ball and run it down the field, but the "evidence" is a shady photo of a supposed FB page on an unidentified phone that no one can find now... #TorontoAttacks #WaitForFactspic.twitter.com/FrBdnGeqUu
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
It actually says it could be a backdated hack in the article 
yes but that's media ass covering. Again in a mass murder of 10 people facebook has a lot of incentive to check it carefully before going public and likely told cops before telling media.
Because Facebook can’t be hacked to make it look like something happened at a different time. Maybe it can’t. But I doubt it.
Facebook knows when a Facebook page has been hacked when they bother spend the time to look. In a case of a #Terrorist mass murder of 10 people? They'll spend the time to look.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.