Saying "in the competitive environment of StarCraft II you might occasionally stumble across unsavory behavior," Battle.net has instructions on how players can snitch on these unsavory types using the StarCraft II: Wings of Liberty client. They say: "If an opponent simply lacks sportsmanship, we suggest you block communication with that player through the in-game message log or by right-clicking on their character name in the Battle.net menus and selecting the block option. However, if someone seriously crosses the line, we encourage you to help us set them straight." They go on to outline how to notify them about bad behavior, giving examples of their game policies against spam, harassment, real-life threats, inappropriate names or map content, and cheating.