Googled a restaurant and saw it wasnt as busy as it normally is apparently. How does google know that?
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By detecting how many google devices are in there. Most phones have google apps in them nowadays except for some Apple die hards who refuse to use anything but proprietary apple apps, so it’s generally pretty accurate.
Traffic predictions on google maps work the same way. It’s how a guy famously created a false traffic jam on google maps by dragging a cart full of cellphones
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