Do some research on this addon! Ghostery Sells Data To Advertisers Puntuado con 1 de 5 estrellas
"Ghostery's enterprise services, branded since April 2014 as Ghostery Enterprise, provides services for businesses needing to track and manage the effectiveness of their advertising operations (Marketing Cloud Management and Competitive Intelligence, previously branded as Evidon Labs), and provides tools for complying with self-regulatory guidelines for online privacy and behavioral advertising." (http://en.wikipedia.org/wiki/Evidon). In other words, they work for the advertisers.