Hahaha. That's one of my favorite board games now.
My friends suck at diplomacy, they are too trustworthy, honest and naive. They're all predictable, and I pretty much know who will be a trusty ally, and my enemy(my brother -.-).
Well online at webDiplomacy where we have a BM game going on now you can do Anonymous so you don't have to worry about them being your ally or enemy based on who you are as much.