Agreed. I also think it's important to post things that you disagree with from time to time.
Addendum: To be more specific, I agree that the hubwheel isn't a like button. It's whatever you think it is, which is the intent. I'm a big fan of ambiguity. We all know that it shares that content with those that follow you, and hopefully that is of consequence. Some of my favorite posts start with few shares, but the post then spurs a good conversation, which then induces people to reluctantly share it.