The monetary value of twitter data for marketing and R&D purposes is mindblowing. Twitter is selling (yours and mine) public tweet data to two different research companies.

Online companies know which websites we click on, which adverts catch our eye, and what we buy ... increasingly, they're also learning what we're thinking. And that's quite a spooky thought.

For instance, Coca-Cola Co could look at what people in Massachusetts are saying about its Coke Zero, or Starbucks Corp could find out what people in Florida are saying about caramel lattes. Companies can also look at how they have responded to consumer complaints.
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