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I'd support this if I didn't have to post to xitter to claim my username.

Really odd approach.

You can also use HN but your HN account will be either shadow banned or rate limited because then you are spamming.

Instead of telling people to post spam in the thread, they should do the same way that is done for example by these:

Those tell you to put a text in your HN profile “about” section.

I don't think the point is to link the HN account to the PF account. I think the point is to spam HN.