4Chan has various image-sharing bulletin boards, where users post anonymously. Perhaps the most infamous board is the “/b/” board for “random” topics. This board emphasizes “free speech” and “no rules” (with exceptions for child pornography and some other illegal content). In these message boards, users attempt to troll each other and post the most shocking content they can come up with. They also have a history of collectively choosing a target website or community and doing a “raid” where they all try to join and troll and offend the people in that community.
This part really shows how anonymity plus a “no rules” mindset changes behavior. It feels like the goal shifts from sharing ideas to just getting reactions, no matter the harm. Calling it “free speech” sounds ideal in theory, but here it mostly seems to reward whoever can be the most shocking or offensive.