As you cruise around the internet, you generate an exhaust of rich personal data: your name, your friends’ names, your birthday, your last known location, your weakness for cat photos … and on and on.

Companies like Facebook and Google hoover that data up and sell it for profit. How much profit, exactly? One estimate says less than a dollar, while others put it as high as $100.

A proposed new law would force tech giants to tell users just how much they can make off this private info. It’s a nice idea, writes University of Virginia’s Samuel Lengen, but it’s not going to work.

Also today: Mexican women are mad, economic incentives don’t work and supersonic airplanes could make a comeback.

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Your social media data is immeasurably valuable. 13_Phunkhod/Shutterstock.com

How much is your data worth to tech companies? Lawmakers want to tell you, but it’s not that easy to calculate

Samuel Lengen, University of Virginia

A proposed bill would force tech companies to tell users how much their data is worth. But how can a single number capture data's power to predict your actions or sway your decisions?

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