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Have a failover DNS provider. Amazon uses Dyn, but also has UltraDNS as a backup, and it's obviously still up. Twitter vs Amazon:

host -t ns twitter.com: ns3.p34.dynect.net, ns4.p34.dynect.net, ns1.p34.dynect.net, ns2.p34.dynect.net.

host -t ns amazon.com: ns3.p31.dynect.net, ns4.p31.dynect.net, ns2.p31.dynect.net, pdns6.ultradns.co.uk, pdns1.ultradns.net, ns1.p31.dynect.net.

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Thank you so much for mentioning this. This was my first thought when I heard about all the major enterprise sites affected by the DDoS:

"How do all these major players have singly-homed DNS"?

if you utilize geoip routing features of one provider, it can be difficult to impossible to then ensure repeatable/deterministic behavior on a second provider.

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