This paper has been written especially for children and adolescents, and is a contribution of ECPAT International to the World Congress III against Sexual Exploitation of Children and Adolescents held in Rio de Janeiro, Brazil, 25-28 November 2008. It presents the law enforcement response to online child sexual abuse since 2001, and includes a discussion of progress made since the Second World Congress in Yokohama in 2001, the current and new trends and an outline of research and development needed.