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We didn't have enough data from those locations.

Egypt has over 100 million people. Facebook/WhatsApp is quite popular in that part of the world, so I would image it had significant traffic..

Because most of the outage happened in the early hours of the morning AU time, so not that many people online.

Also curious about the green part.

It's an anomaly. I think that was right on the edge of "not enough traffic to report on".