Reading HN never seems like work. I feel like I could do it all day.
Yeah, I could share/blog/tweet (and I do, but not much) but often the things that are interesting later aren't things I share right away. Still trying to solve that problem.
Among many others, I managed to positively affect my company this way by pointing my boss in the direction of good solutions and clarifying which of his ideas are actually feasible.
Of course, for a lot of people uninterested in tech and programming, reading HN would seem like work. And, for many tech people, socializing also seems like work. So I guess it's a matter of what group you're comparing against.