Btw KaW uses Facebook as a login so it's not 3rd party advertising and if it is...well..then they are too lol
It isnt third party advertising unless you're actually advertising it. I can say Halo, Call of Duty, and Battlefield without getting into much trouble. I just cant give out my username on that game and tell you to go buy it.
There is already system in place - wall, pm or symply as our dear friend Dylacer said - farm the heck out of it. If any of that fail then that mean he dont give a damn so why should you?! Kick it and get new one who will be active...