Under-reporting of hate crimes based on racism and xenophobia continue to be a significant problem across the Mediterranean. Hate speech and discrimination are the most visible part of several violent extremist movements. Violent extremism (VE) is a diverse phenomenon. The spread of violent extremism is currently done through social media network, where the immense accumulation of information requires the expertise on Big Data.
For that, there is the necessity to contribute in several key initiatives identified. The present document intends to present a desk review on the expression of violent extremism in social media network, but, more specifically, tries to give an specific answer on how to combat online hate speech in social media networks through a roadmap.