system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: After a private conversation with family about skin conditions, our phones began showing advertisements on Facebook for Psoriasis medication. Are our phones "listening in" and picking up keywords? We have never searched for such topics or discussed besides verbally.
gpt
Alllllrighttttt guys. Your phones are NOT listening in on your real conversations... They are however, tracking your browsing history and displaying relevant ads to what pages you've been on. In this case, someone on a phone or shared computer must have searched, liked a page or commented of something to do with Psoriasis. 


Edit: Cause people don't believe this, let me tell you a bit how targeted advertising works. Advertisers build comprehensive profiles of their users based on activity on basically any site you go to... That's why people have tracking cookies on their computers and mobile phones. They then take these browsing patterns and "guess" which products and services you might be interested in. Of course, companies have a ton of incentive to be very very good at guessing this stuff since they get paid per click... Hence, customers get freakishly relevant ads.