In 2013 and 2015, the ECtHR in the famous case of Delfi AS v. Estonia recognised the possibility for a website operator to be liable for the delayed removal of illegal comments of internet users. In this case the ECtHR formulated criteria for a website operator’s liability for damage caused to a third party by its visitor comments. The judgment of 2016 in the case of MTE & Index v. Hungary the ECtHR modified the criteria for a website operator’s liability, interpreting it to the benefit of web managers. This article seeks to reveal the criteria for the liability of a website operator and to draw some general guidance that can be applied in similar cases