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He's using "outbound" traffic as a DoS metric which is sort of novel. I guess it looked better than "1000 HTTP requests"?

Actually the number of HTTP requests is 180,000+.

An an HTTP request requires what, 3 packets inbound? Just saying calling it a "DDoS" seems slightly generous.

We also have to remember that these requests are shared between 100+ Facebook server.

DNS amplification works on precisely the same principle.

DNS amplification works by sending huge amounts inbound to a target and overwhelming them.