I think one of the best and chilling example is still: https://en.wikipedia.org/wiki/AOL_search_data_leak https://en.wikipedia.org/wiki/AOL_search_data_leak Ju

I think one of the best and chilling example is still: https://en.wikipedia.org/wiki/AOL_search_data_leak https://en.wikipedia.org/wiki/AOL_search_data_leak Just some anonymous search strings can give you people. And that was in 2006 so nowadays with the quantity of informations people make public you'd get a lot more results.