I'm not surprised. Facebook track browsing habits use it to share advertisements with your friends.
I've shared this story on HN before this was what I experienced from 2016ish:
I saw an ad buried in my facebook feed to "buy Gallium and Bismuth metal in Australia" I thought it was an oddly specific ad so I made a joking post about it - turned out several of my friends were seeing the same ad.
A common friend we all shared who is a high school science teacher spoke up. He explained his class was studying the periodic table and he had purchased samples of Bismuth and Gallium online to show to the class.
I'm absolutely convinced only reason my friends and I saw that ad was because we all shared a friend who was searching for this stuff online.
That level of surveillance is really creepy to me...
I've shared this story on HN before this was what I experienced from 2016ish:
I saw an ad buried in my facebook feed to "buy Gallium and Bismuth metal in Australia" I thought it was an oddly specific ad so I made a joking post about it - turned out several of my friends were seeing the same ad. A common friend we all shared who is a high school science teacher spoke up. He explained his class was studying the periodic table and he had purchased samples of Bismuth and Gallium online to show to the class.
I'm absolutely convinced only reason my friends and I saw that ad was because we all shared a friend who was searching for this stuff online.
That level of surveillance is really creepy to me...