A teenager tracked Elon Musk's jet on Twitter. Then came the direct message.

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A good example on how collection or sharing of data can lead to loss of privacy and its attendant danger...

The exchange highlighted the tension between open public records and privacy - and it was not the first time famous people had been tracked. Journalists have used flight-tracking apps to follow politicians before vice-presidential selections. Investors use them to shadow CEOs to get wind of corporate mergers. Sports fans have used them to track coaching candidates of their favourite teams.

the Federal Aviation Administration (FAA) required planes to transmit location data to prevent collisions and to help find lost aircraft.

"There almost couldn't be a greater power asymmetry between Musk and this teenager," Calo said. "This is not David and Goliath. This is like Goliath and a flea on David."