Foundcity is a social mapping tool for creating a personalized map of your life on-the-fly. Using your mobile phone, you tag or capture photos throughout the day, label them with any words you want, and send them to your map
Diigo is about "Social Annotation", a superset of social bookmarking. We believe that the social annotation service provided by Diigo can really enhance your experience for online browsing and interactions, and for information gathering and sharing.
"My guess is that federation across tag spaces will be accomplished by aggregators and search engines. When the subject is avian flu, they'll enable you to compare the resources cited by nonspecialists with those cited by various kinds of specialists (...
"Tagging in and of its self is a helpful step up from no tagging, but is no where near as beneficial as opening the tagging to all. Folksonomy tagging can provide connections across cultures and disciplines (...)"
"Tagging works because it strikes a balance between the individual and social. It serves the individual motive of remembering, and forms a ad-hoc social groups around it."
A. Hotho, R. Jäschke, C. Schmitz, and G. Stumme. Proceedings of the 3rd European Semantic Web Conference (accepted for publication), Budva, Montenegro, (June 2006)
A. Mathes. Computer Mediated Communication, LIS590CMC (Doctoral Seminar), Graduate School of Library and Information Science, University of Illinois Urbana-Champaign, December, (2004)
C. Schmitz, A. Hotho, R. Jäschke, and G. Stumme. Data Science and Classification. Proceedings of the 10th IFCS Conf., page 261--270. Heidelberg, Springer, (July 2006)