Gossiping
Planting rumors are intended to achieve a goal (sending a warning, using harm, avoiding to confront directly about a problem, etc.). Be careful about acting on what you heard, be suspicious about hidden agendas for spreading lies. Avoid gossiping about your boss. Should you be the target, the best strategy is ignoring what you heard. You will never know what exactly have been being said about you and by whom. Listen to gossip, show your interest in it even pass it on occasionally, but never allow yourself to be identified as its source. Don't trust others to keep secret.