If you didn't see anything new in the front end, you didn't follow the directions in the README file. Specifically, you must modify your K2 template, or select the template supplied with the package.
I only registered because of this plugin, so its my first vote. All the other bookmark services did not do what i was looking for and thats: just a "I like-Button" on each of my contents, and the content automatically moves on to FB.
Just great, and thanks to the developer!!!!!