The answer to this question is easy, istockphoto.com is the most 'popular', they have the largest amount of visitors by far. Popularity is important, but the real questions you should ask are:-

Q: What are the recommended stock photo sites to upload my work to?

or perhaps...

Q: As a buyer, what are the best value stockphoto sites to buy from?

Click on the above links for the answers to these important questions

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