If you have reached your maximum points and levels for the day (which today is 75 points and Level 5), then if a question you answered is selected "best answer" AND the OP used their screen name, you would get 10 "extra credit" points. Anonymous questions do not earn you extra credit points.
So, if you were to select my answer as "best answer" AND because you used your screen name, I SHOULD be able to get the extra 10 points. I have only received "best answers" from anon OP's...so I'm waiting to see if that is what "unlocks" this feature! :o)
at 9:31 PM on Jun. 24, 2010