"Uh, no," the tech executive replied.
"If you've messaged anybody this week, would you share with us the names of the people you've messaged?" Durbin followed up.
"Senator, no, I would probably not choose to do that publicly here," Zuckerberg said.
"I think that might be what this is all about—your right to privacy, the limits of your right to privacy and how much you'd give away in modern America," Durbin said.
Durbin's point, that most people wouldn't agree to share much of the information they inadvertently do by using Internet services, is an issue that could be magnified in the age of shared autonomous vehicles.
The industry already has grappled with privacy issues. In 2014, General Motors found itself in hot water when critics pointed out a feature in the 2015 Chevrolet Corvette Stingray that allowed owners to use audio and video to monitor the interior of the car could be used for nefarious purposes. With the advent of connectivity and an increasing array of cameras and sensors around the vehicle, self-driving cars could become the equivalent of Big Brother on wheels.
But the real challenge car makers will need to deal with isn't faceless hackers, it's the situation Facebook is answering for: business partners and suppliers playing fast and loose with the data they are supposed to be guarding.
"Manufacturers are collecting data from your use of the app, and there's a back channel going to somebody you have no relationship with," said Brian Wassom, a privacy attorney at Warner Norcross & Judd in suburban Detroit. "It's not just the OEM. It'll be any one of hundreds of different suppliers or software authors—service providers that provided some sort of component that may violate privacy."
And as vehicle technology advances, these companies may clamour to monetize the vast amount of data they'll be able to collect—from the hotels you like to visit to all the people you talk to on your daily commutes. Auto makers, suppliers and tech companies must come together to continuously improve best practices for data ownership and consumer communication while they're still in the early stages of development. Otherwise, they may find themselves in Zuckerberg's seat 10 years down the road.