The Google Crisis Response page for Moore Oklahoma has a link to the Red Cross Safe and Well site:
http://google.org/crisismap/2013-oklahoma-tornado
I see no other announcement or links from Google's pages that Google Person Finder has been activated.
It is good to not have clashing messages go out to public as to where to report missing persons. I've always supported the use of Safe and Well domestically. I assume Google decided to redirect people to Safe and Well from their Crisis Map - that's great.. but I guess the Person Finder instance should be taken down and redirected as well.
Best regards,
Mark