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The groupthink and exclusionary behavior exhibited by tightly knit online communities (cliques) that prioritize in‑group loyalty over fairness, accuracy, or justice. Clique mentality manifests as reflexive defense of clique members, regardless of their actions; automatic hostility toward outsiders or critics; and a shared narrative that frames the clique as virtuous and its targets as threats. It often turns servers, subreddits, or fandom spaces into echo chambers where accountability applies only to outsiders. Clique mentality is the social engine behind many forms of gangharassment, as cliques act as ready‑made mobs.
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