A startling leak suggests that your phone may be listening to your conversations.

Millions of people have long suspected it, but a recent leak suggests that our phones may indeed be listening to us. An alleged pitch deck from one of Facebook’s marketing partners appears to reveal how the company eavesdrops on users’ conversations to create targeted ads.

The slideshow, attributed to Cox Media Group (CMG), claims that its “Active-Listening” software uses AI to gather and analyze “real-time intent data” by listening to what you say through your phone, laptop, or home assistant microphone. According to the deck, advertisers can combine this voice data with behavioral data to target consumers who are actively in the market.

The pitch deck further suggests that major companies like Facebook, Google, and Amazon might be using CMG’s Active-Listening service to tailor ads for their users.