Trolling.
research strongly links narcissism to online trolling, especially antagonistic narcissism, as trolls often exhibit traits like a sense of superiority, lack of empathy, and a need to provoke or demean others for attention, though high self-esteem can buffer this tendency. Trolling provides an outlet for the less healthy aspects of narcissism, like enjoying causing distress or feeling superior to "lesser" individuals, fitting into the "Dark Tetrad" (narcissism, psychopathy, sadism, Machiavellianism) linked to trolling.