Yea, I found that hubski generally encourages hesitation with sharing stuff, since it's literally sharing, and not just voting up. You shouldn't really be clicking the button for every single "good" piece of content. Reddit, on the other hand, encourages this sort of thing, since it's used as a sorting/filtering system.
I find it neat, since hubski allows posts to become "viral" by having more and more users share. And given that it's user-focused (you follow users), good content is spread, regardless of the tags. Much better than reddit, where you have amazing, yet unknown subreddits.