GMGruman writes: "Paul Krill reports that one of the big uses of the new "Big Data" analytics technology is to mine the information people post through social networking. Which led him to ask "What gives Twitter, Facebook, et al. the right to mine that data?" It turns out users do when they sign up for social networking services, even if they don't realize that — but less clear is the ownership of other information on the Web that these tools also mine."
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