The author would like to acknowledge the contributions to this study by the following people:

Kristen Purcell of Princeton Survey Research Associates designed survey questions that capture the slippery concepts of spyware, adware, and internet security. Lee Rainie, John Horrigan, and Katherine Murray of the Pew Internet Project provided editorial insights and analytical support.

The following people provided valuable advice on the survey instrument: Ari Schwartz, associate director, and Michael Steffen, policy analyst, of the Center for Democracy & Technology, a non-profit public policy organization ( D. Reed Freeman, chief privacy officer and vice president for legislative and regulatory affairs at Claria, a company specializing in online behavioral marketing ( Lewis Rose, chair of the Advertising and Marketing Practice Group at Collier Shannon Scott, a law firm ( Avi Naider, president and co-founder of WhenU, a company specializing in software-based contextual advertising ( Richard Hunter, vice president and research director in Gartner Executive Programs, and his team: Richard DeLotto, Jay Heiser, Avivah Litan, Lydia Leong, and John Girard. Gartner provides research and analysis on the global IT industry (

About the Pew Internet & American Life Project: The Pew Internet Project produces reports that explore the impact of the internet on children, families, communities, the work place, schools, health care, and civic/political life. The Project aims to be an authoritative source on the evolution of the internet through collection of data and analysis of real-world developments as they affect the virtual world. Support for the non-profit Pew Internet Project is provided by The Pew Charitable Trusts. The Project is an initiative of the Pew Research Center. The Project’s Web site:

About Princeton Survey Research Associates: PSRA conducted the survey that is covered in this report. It is an independent research company specializing in social and policy work. The firm designs, conducts, and analyzes surveys worldwide. Its expertise also includes qualitative research and content analysis. With offices in Princeton, New Jersey, and Washington, D.C., PSRA serves the needs of clients around the nation and the world. The firm can be reached at 911 Commons Way, Princeton, NJ 08540, by telephone at 609-924-9204, by fax at 609-924-7499, or by email at