I don't have as many friends on FB/Twitter that would be interested in this stuff, but I do share threads with my brother/close friends that would be of interest to them.

I think while the bulk of HN is technical, many here are just simply interested in tech like myself. I'm a financial consultant, so not too terribly far off the mark, and while I don't comment often at all, I imagine there is a solid group of non-technical readers that are participating in discussions.

Overall I just find myself keeping HN off my other social media because 99% of my FB/Twitter friends have essentially no interest in the topics discussed here.