If you'd like to try this surveygizmo out for yourself, go to Questia and try to win an 80GB iPod by taking their survey. It's actually fun to complete, and the mechanism couldn't be smoother, or less aggravating.
RT @VincentR Social nerworking sites and the production of social capital: http://tinyurl.com/cohqch looks good (via @memeticbrand) [from http://twitter.com/jomiralb/statuses/1216857682]
A. Brew, D. Greene, und P. Cunningham. Proceedings of the 19th European Conference on Artificial Intelligence, Volume 215 von Frontiers in Artificial Intelligence and Applications, Seite 145--150. Amsterdam, The Netherlands, The Netherlands, IOS Press, (2010)