Yahoo Answers: a diagnostic tool.

Yahoo Answers is one of the cornerstones of the internet- right up there with Wikipedia and pornography. As it is such a heavily utilised site occupied at some point by most of the Internet-using world, and the majority of the content is generated by a plethora of grammatically challenged and grammatically anal users, it follows that the all of types of people in the Internet using world can be classified based on their Yahoo Answers submissions.

Know-it-alls
On Yahoo Answers, they are the first to answer every question, and probably refresh the page every two minutes so that they can answer questions before anyone else does. They hold the title of "top contributors" and spend their lives hurriedly researching questions that are completely irrelevant to their lives, on Wikipedia; to defend their prestigious ranks.
How this translates to the real world: They are the people who seem really smart and have an answer for everything. While the rest of us know we can never compete, it gives us secret pleasure when they slip up. And since they contribute so much of their unwanted insight, they are bound to err sooner or later.

Know-nothings
These are the ones who always pose stupid questions that could have been answered by utilising common sense, or failing that, googling their query. However logic eludes them, so they consistently post stupid questions like "Am I ugly?- pics included". To answer that question, if you have to ask then you probably are ugly.
How this translates to the real world: You know the giggly young teenage girls that infiltrate public transport and shopping centres with their high-pitched squeals and XXS sized Supre clothing? That's right. It's them.

Hypothetical thinkers
Hypothetical thinkers: while the title I have deigned to give them sounds ever so creative and Bohemian and analytical, don't be fooled. These are the people who post polls, open-ended questions asking people's opinions, and give their children hippie names with alternative spellings.
How this translates to the real world: They are the thinkers of the lower realms of society, who pose pertinent philosophical arguments in layman's terms. Unfortunately they serve no practical purpose other than selling tie-dyed clothes at Sunday markets.

Useful
Occasionally you may come across an answer that is structured, informative, and relevant; more importantly, it actually addresses the question at hand. These answers are undoubtedly procured by the Useful Yahoo Answerers. There should be more of them.
How this translates to the real world: With any luck, they make up the majority of society. We are in dire need of more of them.

Useless
I HATE THESE PEOPLE WITH A PASSION. They are the ones who post "sorry, I don't know" as an answer to EVERY SINGLE QUESTION that they chance upon. If you don't know the answer, then don't post anything! It is a waste of everyone's time and downloads.
How this translates to the real world: In RL, these people are chatty, perseverant and pathetically boring. Like the nice kid who you can't hate because they're nice, but avoid anyway because they're annoying.

Annoying (by accident)
They genuinely try to be helpful and contribute. Unfortunately they fail dismally, with irrelevant answers that make no sense and have questionable grammar and spelling.
How this translates to the real world: These are the people who try to fix something and break it even more. They are irritating, but you can't help but feel a maternal empathy for them.

Annoying (on purpose)
Those who love to post questions to "test" Yahoo Answers- they conjure up silly queries typically relating to tasteful topics such as incest and racism. Luckily these questions are usually addressed by more of their kind, so if they just keep to themselves, everybody wins.
How this translates to the real world: They are the type to always yell out "THE GAME" and feel a sense of superiority because they have in-jokes with the Internet. They also manage to balance this with maintaining a perfect score in their computer game of choice. They are advantageous to society because they stay indoors or inside EB games, far far away from the sane world.