An online conspiracy
By Dominic Casciani, BBC Home Affairs correspondent
The document is called "The Great Replacement" - it's not something just dreamt up, but the title of a loose global movement that has been rapidly growing online.
The central tenet of the conspiracy is that "European peoples" are dying out and being "replaced" by immigrants with a different, inferior and dangerous culture. This is basically a code for hatred or fear of Muslims.
Part of the theory is that states and corporations are encouraging "white genocide" by pushing up immigration rates purely to keep global capitalism going. Occasionally, the theory dips into anti-Semitism and neo-Nazi beliefs by blaming Jews for the world economic system.
The phrase The Great Replacement first emerged in France.
Its most public advocates include followers of Generation Identity, a European anti-Islam movement.
But more importantly, the conspiracy is a central part of a vast and growing range of online forums - particularly hidden groups on Facebook and other social media platforms.
It's in these groups that believers, divorced from facts and trusted reputable sources of information, share fake news links and reinforce their own fears.
By Dominic Casciani, BBC Home Affairs correspondent
The document is called "The Great Replacement" - it's not something just dreamt up, but the title of a loose global movement that has been rapidly growing online.
The central tenet of the conspiracy is that "European peoples" are dying out and being "replaced" by immigrants with a different, inferior and dangerous culture. This is basically a code for hatred or fear of Muslims.
Part of the theory is that states and corporations are encouraging "white genocide" by pushing up immigration rates purely to keep global capitalism going. Occasionally, the theory dips into anti-Semitism and neo-Nazi beliefs by blaming Jews for the world economic system.
The phrase The Great Replacement first emerged in France.
Its most public advocates include followers of Generation Identity, a European anti-Islam movement.
But more importantly, the conspiracy is a central part of a vast and growing range of online forums - particularly hidden groups on Facebook and other social media platforms.
It's in these groups that believers, divorced from facts and trusted reputable sources of information, share fake news links and reinforce their own fears.
