It's a scenario as disturbing as it is common: Your boss becomes your virtual pal on online social network Facebook. There are defensive tactics you can adopt as soon as you get the initial request. "It's like an unwritten rule that your boss shouldn't add you, or, if he does, than you have the right to slap privacy restrics on his ass," says a young magazine writer who's been "befriended" by several of his superiors. But some employees still wonder how to handle the finer niceties of such a fraught relationship—like, for instance, when your boss sends you a $1 imaginary gift to compensate for a real-world slight or oversight.