[aselzer]

It's not just "trolling". the text describes it as antisocial behaviour (defined as "undesired behavior, which includes trolling, flaming, bullying, and harassment").

To me it seems like detecting "trolling" could be as difficult as detecting sarcasm. It requires information about the context and complicated logic. "flaming", "bullying" and "harassment" usually follow much simpler patterns (language, targeting specific users).