One can easily imagine Google having the ability to provide the CDC with localized information where given a list of infected individuals, provide a list of high risk individuals that should be contacted.
FB may have the same capability.
Is this a reasonable idea, or are there not immediately obvious drawbacks to using data this way?
Hopefully, my efforts to evade, confuse, and hide from spying companies like Google and FB have been effective enough that I wouldn't appear on such lists regardless, though.