A "You" Diversion was a form of propaganda.
It was used by the conceptual entities as well as the enemy. The purpose was to make the subject unsure whether or not they had been brainwashed, thus causing them to doubt every action they made and be less useful to their own side. The entry in The Book of the War may have hosted a Shift attempting a "You" Diversion itself. (PROSE: The Book of the War)