Rated 3 out of 5 stars
Pro: Very, very useful. Very useful. Did I mention that it's useful?
Con: No glaring weaknesses. However, it would be nice if the "Shorten and Share on Facebook" function either automatically closed the tab that's opened or brought you to Facebook. On my machine, when I click "Share Link" I see a focus change then... nothing. Facebook is updated, but I would only know my post was successful by going to Facebook.
Twitter, on the other hand, works great.