Cambridge Analytica whistleblower Christoper Wylie, appearing before a committee of British MPs on Tuesday, said that Facebook has the ability to spy on users in their homes and offices.

The British parliament is investigating Cambridge Analytica’s involvement in the Brexit election. MP Damian Collins, who chaired the committee, asked Wylie whether Facebook has the ability to listen to what people are talking about in order to better target them with ads.

“There’s been various speculation about the fact that Facebook can, through the Facebook app on your smartphone, listen in to what people are talking about and discussing and using that to prioritize the advertising as well,” Collins said. “Other people would say, no, they don’t think it’s possible. It’s just that the Facebook system is just so good at predicting what you’re interested in that it can guess.” He asked for Wylie’s thoughts on the possibility.

“On a comment about using audio and processing audio, you can use it for, my understanding generally of how companies use it… not just Facebook, but generally other apps that pull audio, is for environmental context,” Wylie said. “So if, for example, you have a television playing versus if you’re in a busy place with a lot of people talking versus a work environment.” He clarified, “It’s not to say they’re listening to what you’re saying. It’s not natural language processing. That would be hard to scale. But to understand the environmental context of where you are to improve the contextual value of the ad itself” is possible.

Wylie continued: “There’s audio that could be useful just in terms of are you in an office environment, are you outside, are you watching TV?”

 

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