coincidentally, Janes unknown message was about topic C. Likely because she too believed it to be applicable to John.
---
Going further...
Maybe topic A was trending in Janes area. Jane's friend Sally got ads for topic A. sally talked to Jane about topic A. Jane searches topic A
A trend emerged where people who searched topic A, very soon afterwards searched topic E.
Jane is very late to hear the news about topic A. She gets shown ads for topic E. Jane thinks advertisers are reading her mind because she was thinking about topic E but didnt talk to anyone about it.
Jane sends unknown message to John
John fits the target profile of topic C
John gets shown ad for topic C
---
coincidentally, Janes unknown message was about topic C. Likely because she too believed it to be applicable to John.
---
Going further...
Maybe topic A was trending in Janes area. Jane's friend Sally got ads for topic A. sally talked to Jane about topic A. Jane searches topic A
A trend emerged where people who searched topic A, very soon afterwards searched topic E.
Jane is very late to hear the news about topic A. She gets shown ads for topic E. Jane thinks advertisers are reading her mind because she was thinking about topic E but didnt talk to anyone about it.