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Not necessarily. At a minimum you need access to the sensory environment of the subject: Teens on Twitter are more easily radicalized when their timeline consists largely of terrorist propaganda or war front reporting on civilian casualties. Facebook has done experiments where they changed the sentiment of the timeline for a certain user and saw a significant sentiment change in future posts by that user.

Besides, the average human is not able to set a password, and their brains are open to all sorts of attacks. Cults, terrorist organizations, and multi-level marketing schemes abuse these weaknesses to get their followers to do things that may not be in their own best interest.