The system monitors activities, movements, and other behavior patterns necessary to determine whether an avatar is a spam advertisement. A storing mechanism stores a “black list” and a black list score consisting of a list of spam avatar identifications (UUIDs) matching avatars that have been flagged as confirmed or suspected spam advertisers. Another mechanism allows the owner to redraw or otherwise re-render a distinguishing mark or other audible signature when an avatar has been detected as being a spam advertiser. Yet another mechanism signals to the owner an offending avatar that they have been added to the black list or had a report filed against them, and a reason as to why (the methods used to identify them). Another mechanism allows for a black listed avatar to be removed from the black list, and scores to be decreased and for the virtual universe and users to utilize the black list and score.