According to this study, there really is a correlation:
http://www.slate.com/articles/health_and_science/climate_desk/2014/02/internet_troll_personality_study_machiavellianism_narcissism_psychopathy.html
The research, conducted by Erin Buckels of the University of Manitoba
and two colleagues, sought to directly investigate whether people who
engage in trolling are characterized by personality traits that fall
in the so-called Dark Tetrad: Machiavellianism (willingness to
manipulate and deceive others), narcissism (egotism and
self-obsession), psychopathy (the lack of remorse and empathy), and
sadism (pleasure in the suffering of others).
It is hard to overplay the results: The study found correlations,
sometimes quite significant, between these traits and trolling
behavior. What’s more, it also found a relationship between all Dark
Tetrad traits (except for narcissism) and the overall time that an
individual spent, per day, commenting on the Internet.
The research document itself can be found here:
http://www.sciencedirect.com/science/article/pii/S0191886914000324