(This document requires the use of Adobe Acrobat Reader). by Cameron Marlow, Mor Naaman, danah boyd, Marc Davis. Yahoo! Research Berkeley and UC Berkeley School of Information. Semanticmetadata.net. "Abstract: In recent years, tagging systems have become increasingly popular. These systems enable users to add keywords (i.e., 'tags') to Internet resources (e.g., web pages, images, videos) without relying on a controlled vocabulary. Tagging systems have the potential to improve search, spam detection, reputation systems, and personal organization while introducing new modalities of social communication and opportunities for data mining. This potential is largely due to the social structure that underlies many of the current systems..."

(This document requires the use of Adobe Acrobat Reader). By Lisa Ann Ginger. SEO-Easy.com, 2006. "... I've put this short report together to help those people start driving traffic to their blogs and sites and introduce them to the world of tagging. I was able to compile it from the top questions I frequently get ask..."

Memo, by Lee Rainie. Pew Internet and American Life, January 31, 2007. "Just as the internet allows users to create and share their own media, it is also enabling them to organize digital material their own way, rather than relying on pre-existing formats of classifying information..."

Interview: Author David Weinberger describes how tagging changes people's relationship to information and each other.