This document summarizes a 4th LTTA (long term training activity) held in Romania from March 30th to April 4th 2018 on fighting discrimination and racism. It defines various types of discriminatory speech like hate speech, homophobia, sexism, ageism, anti-semitism, and Islamophobia. For each type, it provides reasons they exist and how social media enables their spread. It also outlines when hate speech can become a criminal act, such as inciting violence. Links to additional resources on these topics are included.