Very likely the same way that targeted advertising is carried out, which most certainly does occur. Also, 4chan has a history with law enforcement, including the FBI, and the military. Moreover multiple studies have been carried out by academia including by the Israeli military in regard to demographics. The point is that an entity like Palantir could be applied to reduce hate speech and violence. Rather than serve an ad it uses AI to generate a post that is humorous yet very curated in an intrusive insidious fashion.