A fun idea from earlier — a GeoIP price-index commodities captcha. E.g. "What does a liter of milk approximately cost where you are?" you can both determine a likelihood that the user represents a person actually in a place, and develop a cool global commodities price index.
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Replying to @starsandrobots
Hmm, doesn't give you the @premisedata-style price index but "take a picture of some milk in your fridge" is neat because milk distribution & branding is so local, and milk is always date-stamped.
7:47 AM - 25 Sep 2018
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