"I Blank This" is an "I Like This" button, except you can replace the text with anything you want.
I downloaded it because I wanted a way for someone to rate a post as "Awesome!". It works to let you rename the link at the bottom of posts, and you can rate it, but if there is supposed to be a way to undo the rating, I wasn't able to find it.
Also, the author's site is down, so at some point this will probably break, but at least for now it still works.
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