According to one of the founders, "Login with Amazon" doesn't grant access to a user's Amazon account.[1] If they were using it, there would be no need to ask for users' passwords.

1: https://news.ycombinator.com/item?id=8070310

A/B testing showed that the Norton security badge is perceived positively. Does anyone have a different experience?

I would guess that A/B testing against HN users would provide different results than the general population.

I can't speak broadly, only from my personal reaction. I also left the site after seeing the Norton logo (and before reading the comments here), because it seemed completely misplaced. I associate Norton with cleaning my computer of badware, not of whether or not some just-launched service is treating my data securely.

Because it seemed out of place, it felt like it was an obvious tactic to bootstrap trust where there wasn't any. A better icon (for me) would have been a badge from your SSL provider, or even just some well designed lock icon.

Very interesting point. The Norton batch is our SSL Batch (Symantec bought them or vice versa).

It seems like they need to do a better job of education users about that. I don't think they have a pure "Symantec SSL" batch anymore.