"This discussion paper seeks to give an overview of the key aspects that need to be taken into consideration to address the occurrence of hate speech on social media, be it through concrete regulations by social media companies, counter efforts and legislations or preventive educational measures. The paper is divided into three sections: part 1 focuses on definitions of hate speech and associated legal frameworks, part 2 reviews and addresses tools and techniques for monitoring hate speech online and discusses measurements of the prevalence of online hate speech and part 3 discusses potential counter and preventive measures." (Page 2)