I started using it through @NoCamels which is nice because I really do like the articles they publish, so to me it was win-win...share stuff I like with my friends AND see if they really clicked :-)
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We've been using it on dapulse blog. It's been generating engagement (users stay on site longer and continue to additional posts).
It's also supplying us with valuable information on the flow of users through our blog's content, on their way to signup.
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Hunter
I posted this because I realized that even I was sucked in to using this...getting feedback on how many of your shares actually generated interest is great from a user AND company level.
I think there should be more two-sided thinking done for this sort of thing...I'm sure there are others, but this one is really nice.