A lot has already been said about the 6-hour Facebook outage of 4th October 2021. Instead, I will take a different approach; visualizing it.
It is becoming increasingly important, especially on mobile devices, to have your apps support IPv6. What does it take to get your app ready?
There are no longer any IPv4 addresses available for allocation from IANA. This means that adoption of IPv6 is now of paramount importance.