http://www.youtube.com/watch?v=3-WXYg-S05U

tl;dr: Officially, he's not allowed to say parsers are okay. He can only caution players to be discreet and responsible with them. Essentially, don't try to use your parsing numbers to harass other players. If someone reports you AND you have a parser running, you're likely going to see a ban or suspension.

I'm a little surprised this topic isn't being discussed further.