What is data processing?

What free or low-fee websites offer the most data processing features?

I am doing a research project and would like to know which free (or low fee) websites are out there that offer visitors the most powerful data processing functionality. The type of functionality I'm referring to would be as follows 1) User enters text info on some topic 2) Site saves data and displays it for other visitors to view 3) Site allows visitors to sort/query/comment on this data 4) Site provide statistics and other real time analysis of this data Excluding Facebook, Wikipedia, YahooAnswers, StockBrokerage & Online Dating sites, are there other sites out there that come to mind? They can be obscure ones. I am just interested to find out what functionality is currently available--what are the possibilities. Thx.
Answer:

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