I actually feel far more at home on Hubski than anywhere else on the Internet. On other sites I like to lurk rather than get involved. On Hubski, however, I've actually felt comfortable enough to start a blog with a stranger and sign up for the Pen Pal program. I like to think I've carved out a bit of a niche here and I actually have what I like to think is healthy amount of followers. I recognize different users here and encounter them frequently. Most notably I've noticed lately most of my comments receive at least one share. Not that I measure the comments worth by how many shares it has but its still nice to know people have read the comment and took the time to acknowledge it. EDIT I guess I didn't really answer the original question. I share a lot more often than I comment. Most of the time I just think the submission is interesting and I want other people to see it. I only comment if something particular strikes me and I feel the need to say it.