Where people come to troll, flame or just plain argue over irrelevant issues.
Basic intelligence is not a major component to the YouTube Comments Section. You're better off just watching the video without reading all the stupid comments (complete with numerous spelling and grammar mistakes).
The people responsible for all the awesome shit we have (the internet, for example). Also the people responsible for bringing us the best movies, TV shows, books, video games, and the list goes on...
The Simpsons (in its heyday), Futurama, South Park, The Mario, Donkey Kong and Zelda franchise of video games, and the ability to communicate with anyone in the entire world in a fraction of a second are just some of the awesome things we can attribute to nerds.
A popular online slang dictionary where 99.99% of the definitions are written by angsty teens with a bitter and cynical outlook on life, although most come from privileged middle class families and have their own credit cards.
Just go to Urban Dictionary and look up 'puppies' or 'sunshine', and I bet some bitter, angst-ridden teen has written a negative definition about it.
Usually some geek with an inflated ego and inferiority complex, trying to prove their intellectual worth to complete strangers, whom they'll never meet, on the internet. Will often illogically accuse you of logical inconsistencies/fallacies in your arguments, or just resort to picking apart a slight typographical/grammatical error, to give themselves an inflated sense of self worth. While the majority of YouTubers are annoying asses like this, sitting on the sidelines reading page after page of two YouTubers going at each others' throats like a pack of savage dogs can be of greater entertainment value than the video above.
If you want an example of a typical YouTuber, just hop on over to YouTube, click on almost any video and read the comments below. Enjoy.