0 the study of how computer technology can be used to change people's opinions, or to persuade them to do something: --
What is B.J. Fogg's greatest hope for captology? World Peace.
Captology: how the Fitbit pedometer really motivates its users.
Captology is derived from “Computers as Persuasive Technologies”.
Persuasive technology and its field of study, captology, was pioneered in large part by B.J. Fogg, who began studying the use of persuasion in technology in the 1990s.