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Re:Facebook’s Safety Check is a stress-inducing flip of soci... by dx034 on Thursday June 15, 2017 @02:31AM (#14558341)
> About 500 people were directly endangered by this incident. The Safety Check alert seems to extend well beyond Greater London, so at least 9 million people. That gives us an approximate false positive rate of 99.995%.

I live in London but have friends around the world that haven't visited me yet and don't know where I live. After an event like yesterday I get a lot of messages asking if I'm ok, so using the safety check can help even though there was no remote risk that I could've been affected.

I think it's reasonable that the safety check area is that large, it helps for friends/family who don't know exactly where you are.

Re:Facebook’s Safety Check is a stress-inducing flip of soci... by alistairSH on Thursday June 15, 2017 @01:18PM (#14562343)
As a counter to that, I have friends in London and I didn't think to check in on them. Somebody would have called/texted/emailed if those friends were in trouble. As said above "no news is good news".