Christian Fuchs. 2020. Nationalism on the Internet: Critical Theory and 
Ideology in the Age of Social Media and Fake News. New York: Routledge.

http://fuchs.uti.at/books/nationalism-on-the-internet/
(including reading sample/introduction)
https://www.youtube.com/watch?v=y25je5XtUcQ

In this timely book, critical theorist Christian Fuchs asks: What is 
nationalism and what is the role of social media in the communication of 
nationalist ideology?

Advancing an applied Marxist theory of nationalism, Fuchs explores 
nationalist discourse in the world of contemporary digital capitalism 
that is shaped by social media, big data, fake news, targeted 
advertising, bots, algorithmic politics, and a high-speed online 
attention economy.

The book develops a critical theory of nationalism that is grounded in 
the works of Karl Marx, Rosa Luxemburg, and Eric J. Hobsbawm.