Eh, I wouldn't call what 4chan does "trolling." They get their lulz by hurting people, both to prove they can do it and just to enjoy inflicting pain. They usually want their victims to know exactly what's happening, who's doing it, and why.
I hope trolling doesn't come to mean any kind of maliciousness, because it won't enrich the language much for it to take on such a broad meaning. Thanks to human nature, we already have a pretty comprehensive vocabulary for obnoxious behavior. Trolling in the narrow sense is a handy addition for a behavior that has emerged as an everyday fact of life in the internet age, but trolling used in the broad sense is usually a lazy replacement for a better expression.
Edit/PS: To be clear, what 4chan does is bullying. Harassment, spreading embarrassing information, vandalism, insults, reputational attacks: there is nothing novel about this pattern of behavior. In second grade (the early '80s) my entire elementary school was taken out of class so we could watch a short film about bullying. If I remember correctly, a kid was bullied until one day he fell over dead because he didn't want to live anymore. Cheesy, but it shows that 4chan's methods and intentions aren't new and don't merit a new name. The only novelty is that the bullies' unashamed voice has been added to the conversation, so now we know they do it for the lulz. (Which is what everyone assumed about bullies anyway until someone invented the idea that bullies were abused and miserable themselves, which became the new conventional wisdom until it was challenged recently, and now I think even the touchy-feely types think it's really all about the lulz. But I digress.)
I hope trolling doesn't come to mean any kind of maliciousness, because it won't enrich the language much for it to take on such a broad meaning. Thanks to human nature, we already have a pretty comprehensive vocabulary for obnoxious behavior. Trolling in the narrow sense is a handy addition for a behavior that has emerged as an everyday fact of life in the internet age, but trolling used in the broad sense is usually a lazy replacement for a better expression.
Edit/PS: To be clear, what 4chan does is bullying. Harassment, spreading embarrassing information, vandalism, insults, reputational attacks: there is nothing novel about this pattern of behavior. In second grade (the early '80s) my entire elementary school was taken out of class so we could watch a short film about bullying. If I remember correctly, a kid was bullied until one day he fell over dead because he didn't want to live anymore. Cheesy, but it shows that 4chan's methods and intentions aren't new and don't merit a new name. The only novelty is that the bullies' unashamed voice has been added to the conversation, so now we know they do it for the lulz. (Which is what everyone assumed about bullies anyway until someone invented the idea that bullies were abused and miserable themselves, which became the new conventional wisdom until it was challenged recently, and now I think even the touchy-feely types think it's really all about the lulz. But I digress.)