Urldumper (n.) A person who sends URLs to mailing lists with no further explanation. Pronounciation: like 'Girldumper" without the "g".
Urldumping is a form of clickfraud, but requires readers to switch context expensively before being able to discuss. The related term "pdfdumping" refers to the posting of long PDF documents without explanation. Both urldumping and pdfdumping are considered trolls, if done on lists used for discussion.