1. A method in a virtual universe (VU) system for identifying spam avatars, the virtual universe system comprising one or more avatars that each have behavior characteristics, the VU system having memory that stores behavior characteristics of known spam avatars, the method for identifying spam avatars comprising: testing the one or more avatars to determine the behavior characteristics of the one of the one or more avatars; retrieving from one of the one or more avatars the behavior characteristics of the one of the one or more avatars; comparing the retrieved behavior characteristics with behavior characteristics of known spam avatars; identifying similarities between the retrieved behavior characteristics with the behavior characteristics of known spam avatars; and determining whether the one of the one or more avatars is a spam avatar based upon the identified similarities.