Another controversial use of the packet cluster system is known as cheerleading. A cheerleader in this context is a station that uses the packet cluster system to spot one particular other station for the purpose of promoting that station's contest operation and improving its score. Cheerleading is most evident when several cheerleaders promote a single station, such as when all the members of a contest club repeatedly and aggressively spot a single contest DX-pedition station operated by several members of their own club. Although the station being spotted is not itself abusing the rules of the contest, it may still benefit from the activity of its friends. Many feel that it is difficult to differentiate between undesirable cheerleading and the more normal spotting activity, and that coming up with well-defined rules to prohibit it would have significant negative side effects.