It shouldnt even be a "Facebook Like" It can be a simple "Like" just like "Thanks" ... Because in like 80% of the case.. people give a "Thanks" When they really wanna give a "Like" ...
For example... when everybody posted pics with their drops or other stuff like that.. there is no need for Thanks.. but people clicked the "Thanks" as a "Like" :)
So yea.. I agree a Like button will be cool ... to prevent the "thanks" that are given for nothing ..
Also it will increase the traffic of the epvp ^^
And now you will click "Thanks" On my post.. when you really wanted to press "Like" ^_^