I wonder what Facebook will say when the governments of the world realise they can use this capability to contact their own citizens - especially if Facebook&#x27;s continued operation in that country is contingent on its cooperation.<p>&#x27;Safety Check&#x27; is just the end user experience; the underlying mechanism is a way to propagate messages invasively across a geo-social network. Like any technology, &#x27;good&#x27; or &#x27;nasty&#x27; depends on how it&#x27;s used.