Interesting:

"As part of the study, three independent psychiatrists were asked to evaluate 10 online mind-control accounts identified through a simple Google search. Their task was (a) to determine whether the poster was psychotic based on his writing and (b) to analyze the hyperlinks within each post to look for evidence of social organization among posters and visitors.The three psychiatrists were in high agreement that "signs of psychosis are strongly present" in the 10 accounts, indicating that posters were very likely to be schizophrenic. (Because the psychiatrists were blind to each other's assessments and to the purpose of the study, no "groupthink" process can be blamed for their consensus!) "

What about the fact they were all psychiatrists (so looking for mental illness) and they were "doing" what the psychotic people believed, following around those people secretly.