Unfortunately, Facebook has had reason to use Safety Check in the US for the first time. The social network switched on its tool for reassuring friends following the mass shooting at the gay nightclub Pulse in Orlando, Florida. While Facebook has already called on Safety Check since expanding its scope to include human tragedies (it used the check after an overpass fell in India), the American use reflects improvements made to the emergency system in the following months. It's now faster to invoke checks, the company says to Mashable, and there are tests under way that would let users trigger checks of their own. Let's just hope the feature isn't needed again for a long, long while.