I never have nor never will have a Facebook or Twitter account. Probably not other social media either. It's bad enough having a Google account and all that encompasses. It is astonishing that another company would require an account on some other system. Now I don't have a problem with allowing using your Google, Facebook, etc. account as a convenience to authenticate your account on some other service.
HN is social media.
There is a qualitative difference between HN and Facebook or Twitter. One of these doesn't try to pry its tentacles into every aspect of your life while trying to capture every possible scrap of information about you known and unknown.