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Re:Xkcd: Encryptic by p4bl0 on Monday November 04, 2013 @07:31AM (#6668172)
Actually example.com is reserved for test usage and this kind of things. You are right for the two others thought.
Re:Xkcd: Encryptic by DanBC on Monday November 04, 2013 @07:44AM (#6668208)
But using example on someone else's website to avoid using your own email address is not using it in documentation. .invalid would be a better choice.

I agree that I'm quibbling over probably unimportant details :-)

http://www.iana.org/domains/reserved

http://tools.ietf.org/html/rfc2606