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Maybe it could be done with Steemit. All we need is an new 3rd party app putting a system on top of Steem. Could work weel since nobody needs to pay real money. But requires the individual to have significant amount of Steem Power, so maybe not.

On the small scale we are working toward to start with, I'd back Steemit 100%

To scale up we'd perhaps need more Steemians out in the field but lets not run before we are walking! :D