I have been spending most of my time since I started Torn in the Forums which I find extremely informative and useful.
Well this might have happened to many of us , that is whenever my mouse curser hovers around the Thumbs Up - Thumbs Down Rating of a thread , you accidentally click on the wrong option and it isnt really reversible again.
Recently I came by thread I liked and wanted to give it a Thumbs up but unfortunately giving it a Thumbs-down absent mindedly.
So my suggestion here is to make it reversible so that players can alter their opinion when they opt by mistake :)