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I'd say Reddit would be U.S.A,Tumblr would be Sweden and those personal sites that no one visits would be Micronations.
Don't know about Knowyourmeme though.Nor Do I know what sites would be nations like North Korea,Serbia,Estonia,Germany,Poland,Romania,D.R Congo,Kyrgystan,ETC

Reddit is more politically liberal than Tumblr, which is really saying something. I highly doubt it would be the U.S.A, which is pretty conservative from an international perspective.

Ultra-modern? Check. Otaku culture? Check. A slight misogyny streak that it's trying to shake off? Check. I'd say that Reddit would be Japan.

KYM=

4chan is Somalia.

Knowyourmeme, is site that tries to document what the other countries do, but its government is full of bickering and it's citizens are dissatisfied with every action its government takes

that sounds like the U.S.A

Which website would be the communist country like North Korea?

A site with no upvote/downvote system and extremely strict mods, I would assume.

YouTube would be Brazil. It looks good from the outside, but once you're actually there…

Except for Brazil isn't a dictatorship that forces updates every month that's impossible to stop. Well, that's debatable.

Cracked forums?

What would 9Gag be?

9gag would be dissapointment island.

What website would be like the Soviet Union?

9gag would be North Korea; Nobody wants to be there, yet they claim to be the best place on earth, they are keen on threatening others and boast about their powerful "army" that cannot stand a chance against other countries.