Elizabeth Dwoskin
The Wall Street Journal
January 14, 2013

By enabling location services on an app in which you upload information publicly, such as Twitter, you are broadcasting your location and your identity. Credit: williamhook via Flickr
By enabling location services on an app such as Twitter, you are broadcasting your location. Credit: williamhook via Flickr

Fan Zhang, the owner of Happy Child, a trendy Asian restaurant in downtown Toronto, knows that 170 of his customers went clubbing in November. He knows that 250 went to the gym that month, and that 216 came in from Yorkville, an upscale neighborhood.

And he gleans this information without his customers’ knowledge, or ever asking them a single question.

Mr. Zhang is a client of Turnstyle Solutions Inc., a year-old local company that has placed sensors in about 200 businesses within a 0.7 mile radius in downtown Toronto to track shoppers as they move in the city.

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