The creepy stuff is when bits of such "knowledge" are taken out of context and used to compile a personal profile of you, for purposes from marketing to content

The creepy stuff is when bits of such "knowledge" are taken out of context and used to compile a personal profile of you, for purposes from marketing to content recommendation to social and political engineering. Someone has those partial "facts", but are unable to extract your true motivation for your behaviours and can draw very wrong conclusions.