Digital Footprints: Online identity management and search in the age of transparency / Pew Internet & American Life , 16 December 2007
PDF - http://www.pewinternet.org/pdfs/PIP_Digital_Footprints.pdf
Mary Madden, Susannah Fox, Aaron Smith, Jessica Vitak
"The nature of personal information is changing in the age of Web 2.0. The vast array of data points that make up “personal information” in the age of online media are nearly impossible to quantify or neatly define. Name, address, and phone number are just the basics in a world where voluntarily posting self-authored content such as text, photos, and video has become a cornerstone of engagement in the era of the participatory Web. The more content we contribute voluntarily to the public or semi-public corners of the Web, the more we are not only findable, but also knowable."