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Yahoo Answers?

Surely nobody actually goes there intentionally, creating a website dedicated to giving the incorrect answer (but with an awesome page rank and truly unique rants) to your every Google Search, and twice-weekly providing the Fail Blog with material.

ha ha yes yahoo answers kills it. on the other hand i f-ing hate experts exchange

StackOverflow.com

crackberry.com is another great one

SEO?

yeah sorry of that's ambiguous - i clarified the initial post above. by SEO gems i mean sites which have growth/user acquisition fueled entirely by users searching for stuff.

Search Engine Optimization

To be honest it's not advisable to rely only on search traffic. I say that as a SEO. Returning visitors and often even type in or direct visitors are much better.

Many spammy sites rely solely on Google/search traffic.

http://hubpages.com/ for instance.

Ask HN: SEO gems?