Winning Content Persuades, Not Manipulates
http://www.uxmatters.com/MT/archives/000279.php

Jones, Colleen
UXmatters
2008

Abstract:

Elements of persuasion are important to creating winning content. To help safeguard content from becoming manipulation, we need to understand its distinction from persuasion. As a step toward that understanding, this article: provides basic definitions of persuasion and manipulation; explores the key differences between them; and describes some consequences for UX content.