In these days of anti-tech ire, it’s a popular cocktail hour topic: How much is Facebook making off my data? Last year, I spent a month trying to find out, hawking my personal data on blockchain-based marketplaces. I came away with $0.003. On Monday, when Senator Mark Warner (D-Virginia) announced a proposal to force tech companies to tell users the value of their data, he was slightly more generous, ballparking the average at $5 a month.

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