If you've spent any significant time on the Internet, you'll know what it's like reading spam. Your eyes just glide right off it, identifying and ignoring it faster than conscious thought. Small amounts of spam is easy to ignore; it's when it flares up that it becomes a problem, lowering the signal to noise ratio and scaring away legitimate users. Cracked's comments sections used to be nearly unreadable, dominated by ads for discount Nike shoes and meeting Tall Women.
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This has been less and less of an issue as spam filters get better. But will that last, or our spam-amnesty's days are numbered? Surely there's an elite team of spam-programmers somewhere, draped in Gucci handbags and tall women, frantically working to defeat this.
When cloaked by the anonymity still present on most commenting systems, people tend to act more antisocial then they might otherwise, their facelessness removing all of the negative implications of their actions. Directing dark, scatological threats towards a local weatherman is cause for arrest when done in person. On the internet, it's almost mundane; there's dozen of Tumblrs about it, I'm sure.
It's this anonymity where a lot of the really nasty stuff comes from. Harassment, racial slurs, mocking crime victims; imagine saying something that would cause someone to punch you in the throat, and it's a pretty safe bet that right now, someone is saying it on the Internet, their throat's going dangerously unpunched.
"I dare you to post your address young man, because I will come to you, and I will break you."