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.
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
P. Cimiano, G. Ladwig, and S. Staab. WWW '05: Proceedings of the 14th international conference on World Wide Web, page 332--341. New York, NY, USA, ACM Press, (2005)
P. Cimiano, S. Handschuh, and S. Staab. WWW '04: Proceedings of the 13th international conference on World Wide Web, page 462--471. New York, NY, USA, ACM Press, (2004)