Trolling, as I first encountered the term (on 4chan, many years ago, back when "trolling was a art") was nothing new. My dad's generation calls it "fishing", and engages in it offline by parroting Daily Mail-esque views in the pub because they know I will "bite".
These days it seems to be a cover-word for the sickest, most malicious bullying, and also the most yawn-inducing unimaginative pranks... basically, any behaviour that could possibly be frowned upon by anyone is defended after the fact with "no, I was trolling" (a valid defence when you're espousing views of the far right with no sincerity... a less valid defence when you actually have just done something terrible)
These days it seems to be a cover-word for the sickest, most malicious bullying, and also the most yawn-inducing unimaginative pranks... basically, any behaviour that could possibly be frowned upon by anyone is defended after the fact with "no, I was trolling" (a valid defence when you're espousing views of the far right with no sincerity... a less valid defence when you actually have just done something terrible)