The COST Action IS0801 on cyberbullying had the aim of a) sharing of developing expertise in knowledge base and measurement techniques across researchers, b) sharing of input from outside the research community; specifically, from legal experts as well as from mobile phone companies and internet service providers c) sharing of already nationally published guidelines, and recommended coping strategies, including positive uses of new technologies, and d) increasing awareness of the issue, as well as of the outcomes of the Action. Besides the conferences and Training schools organised, the Action has fostered or facilitated a considerable number of grant applications, publications as well as other outreach activities, and has established a fruitful international network.