The Brief: Doxing is the use or publishing of someone's private or identifiable information gathered from the internet.

DEEP DIVE
Doxing is the use or publishing of someone’s private or identifiable information gathered from the internet. Also spelled doxxing, the word stems from an abbreviation for documents (dox, docx). Information about an individual can be found via hacking or internet research, and the publication of one’s private information is often dangerous and illegal.
Read more about the dangers of doxing and swatting here
You are doxing. This is morally reprehensible as well as against Twitter Terms of Service. Stop. https://t.co/gsVx2rf4EU
— needlessly obscenity-laced (@randileeharper) August 12, 2017
So yeah, please stop with the death threats, rape threats, transphobia, doxing attempts etc.
— Laura Kate Dale (@LaurakBuzz) January 13, 2017