As of now, you can receive Amber alerts for missing children on your Facebook page and on any Facebook connected mobile device. It's a good idea but it could be improved. The way it currently works, you have to sign up to receive the alerts. I have to ask, if Facebook is willing to push advertisements I don't want to see onto my Facebook page without me signing up for them, why can't they push Amber alerts instead? Give up one add space for the latest Amber alert. But that would cost them money and we know Zuckerberg is barely scraping by. Facebook claims the reason you have to sign up is so they know which states you want to receive alerts for, but they already know where I'm at every time I log in so why is the login required?
Anyway, it's not perfect, it could be better, but it's a good move. Here is an article on CNN about it.