Microsoft's bloggin, photo, social something. Seems pretty dead to me - it's online since september 2003, see also http://www.wired.com/news/culture/0,1284,61095,00.html
J. Jung, and J. Euzenat. Proceedings of the European Semantic Web Conference (ESWC2007), volume 4519 of LNCS, page 267-280. Berlin Heidelberg, Germany, Springer-Verlag, (July 2007)