When a few advertisements for topics he had just been discussing appeared in a Facebook user’s newsfeed, he became uneasy.
One evening, a 40-year-old guy who wished to remain anonymous was talking in-depth on his mobile phone to his grandmother about how to remove a tree stump from her lawn.
The journalist then noticed an odd Amazon advertisement for a large “copper tree stump killer” nail appear on his Facebook feed the next morning.
He had never looked up anything related to tree stumps on his phone or computer before or after the talk, nor had he “liked” or commented on the topic anywhere, let alone looked up how to get rid of them.
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