A.D.I. (Advanced Delusional Intussusception) is a phenomenon in which a group of people has an imaginary member of the group. A very rare phenomenon, counting less than 10 documented cases, is one of the least understood phenomenon in our times. ADI was first researched in 1978 by Fred Wiseman, expert in People's behaviour in group scenarios, naming it how it is known today.
by SocioGuy March 18, 2021