Ask HN: Someone's using my ID on the web, what should I do ?

You could try contacting Yahoo about the email, I'm not sure how well that would work, but you've got tons to work with on the domain name.

You're you, he's not. Dispute the domain, how it's your name and your address: http://wdprs.internic.net/

Additionally check out http://www.icann.org/en/udrp/ if you want to go further.

Thanks for these good advise and for the links.

How do you know it's fake? I have a Google Alert set up for my name, and see news about at least 6 other people with the same name as me.

I know it because of the address on who.is, it's mine (I should have known if there was someone with the same name at my building). The all thing seems to be a bad joke, but I want to know who is behind it

Register another top-level domain under your name and out-SEO the imposter.

Good point , I'm not so good at SEO but I'll do my best.

Maybe you're on Substance D?

I thougt about that but no, I also thought about sleepwalking but as far as I know myself definitively no.