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The Yahoo! Groups system manages an enormous number of mailing lists. The service is free to users and list owners because it is supported by advertising. As well as sending list messages to members by email it is possible to read the messages on the web, and one of the methods of advertising is to display an intermediate page with an advertisement on it before the content of a message is displayed. On 5 December, 2002, the following advertisement was being shown to members of the Australian Vaccination Network's list. But what would they care about 30,000 dead children? At least these children weren't exposed to the terrible dangers of vaccines.