[plonh]

But Facebook only activates Safety Check on special occasions.

[davidgay]

Which are extremely likely to be the same occasions where calls/emergency calls are not getting through.

[shampine]

It's still hands down the best feature of the entire product. I don't use Facebook for much, nor do I particularly care for it. But this is an amazing use of social graph and the internet. Whomever at FB came up with the concept, much respect.