The captions are vague, yet the implicit message is clear: Few people in the videos are white, which should concern you.

It's what Dr. Beatriz Buarque, a politics researcher at the London School of Economics (LSE) who specializes in conspiracy theories and the digital politics of truth, calls "a visual representation of The Great Replacement theory," the far-right premise that non-white immigrants are part of a systematic scheme to replace white westerners and their culture. A conspiracy theory Dr. Buarque describes as "very dangerous," as it channels hate toward Muslim, Black, and brown individuals and portrays a segment of the population as invaders and enemies.