US government has invited tech executives of Facebook, Google and Twitter for a hearing on mass violence and extremism. The US Senate Committee on Commerce, Science and Transportation summoned executives of tech giants because of the surge in proliferation of extremist content and mass shootings on social platforms. The hearing titled, 'Mass Violence, Extremism, and Digital Responsibility,' will be convened on September 18. The panel said that this hearing will examine the online proliferation of extremism and also explore the effectiveness of industry efforts to remove online violent content.