yeah i thought this might have happened before, so i took some steps to make it a bit stickier.
1. this seems to be a hot topic right now
2. the domain is reasonably easy to remember
3. it's quick to register
4. to activate your account you have to link back to it from your hn profile page, yes you can remove this link after but hopefully most people will leave it to help spread the word.
It's nicely done, no arguing with that. I just sort of wish PG would find a way to incorporate this or something like it into the official site. Or something along those lines...
I hadn't thought of leaving that link in my profile for that. Perhaps you could make it clearer that that's a good idea? E.g., in the verification, say "Leave the link so people can see find you in the world easily and see your skillset".
ask me in 6 months if it worked :)