Journal of Information Technology Research, 5(3), 85-97, July-September 2012 85 Copyright © 2012, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited. Keywords: Information Disclosure Behaviour, Perceived Severity, Perceived Vulnerability, Protection Motivation Theory, Social Network Sites INTRODUCTION The Social Network Sites (SNS) such as Facebook, MySpace, Twitter, Friendster, etc. have become an unprecedented phenomenon that transform the way people communicate and interact with others. A growing number of Facebook users over time indicate that people have gained the benefit from using its services. The Facebook statistics (Facebook Newsroom, 2012) show that there are 845 million monthly active users at the end of December 2011 and more than 50% of monthly active users accessed the site from their mobile phone. In order to use SNS, potential users need to provide their personal information to SNS for registration purpose. After the new ac- count is confirmed through e-mail, users can An Empirical Investigation on Internet Privacy on Social Network Sites among Malaysian Youths Norsaremah Salleh, International Islamic University Malaysia, Malaysia Ramlah Hussein, Sri Jentayu Sdn Bh, Kuala Lumpur, Malaysia Norshidah Mohamed, Universiti Teknologi Malaysia, Malaysia ABSTRACT People have been using Social Network Sites (SNS) to communicate and make friends online. Although SNS offer many benefits to users, information privacy seems to be overlooked. Based on the Protection Motivation Theory, this study investigated the factors that might influence youths to disclose information about themselves on the SNS. Four factors were investigated to determine whether there are significant relationships between them and information disclosure. The factors were perceived vulnerability, perceived severity, perceived benefits and self-efficacy. A self-administered questionnaire was developed to capture useful information pertaining to the subject matter. Using university students as sample, five hundred questionnaires were distributed and four hundred and eighty six were collected for further analysis. The results revealed that perceived vulner- ability, perceived benefits and self-efficacy were significantly related to information disclosure, while perceived severity was not significantly related. DOI: 10.4018/jitr.2012070105