"Internet trolls" refer to people who purposely provoke and annoy others online by posting mean or offensive comments. They intentionally seek attention and aim to disrupt conversations or upset others for their own amusement. Full definition
Opening up yourself online, however, means that you can become the target of internet trolls that think the internet does not require manners. (lawyerist.com)
They're anonymous Internet trolls who don't have a clue who you are. (babygaga.com)
Ive already discussed how internet trolls in general are more likely to be. (petesgrillandpizza.com)