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WTF is this?
When you sign up for a webhost, they give you a domain sometimes. For instance, if you sign up for NearlyFreeSpeech webhosting, they give you a yourdomain.nearlyfreespeech.net complementary. Then, you can assign your DNS stuff so yoursite.com points to the same site.
That's all that's happened here. People seem to freak out about this pretty often on this site, lol.