Simple site where you are given 1 gb of space to share many things like a simple quote, a picture, or a video. You can keep some things to yourself, share with a small group, or share it with everyone.
F. Mitzlaff, M. Atzmueller, D. Benz, A. Hotho, and G. Stumme. Analysis of Social Media and Ubiquitous Data, volume 6904 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2011)
F. Mitzlaff, D. Benz, G. Stumme, and A. Hotho. HT '10: Proceedings of the 21st ACM Conference on Hypertext and Hypermedia, page 265--270. New York, NY, USA, ACM, (2010)
H. Halpin, V. Robu, and H. Shepherd. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 211--220. New York, NY, USA, ACM, (2007)