Most of our expectations were confirmed and will be reported in detail in Section 4 . Regarding the technical efforts required to use the Web 2.0 as a research tool, they were indeed low. By building on an existing and open service (Principle "architecture of assembly") we were able to offer the students a environment much more attractive than would have been possible by implementing it from scratch. At the same time, due to the open API, we could access all the data required for investigating our research hypotheses. Thanks to existing Web frameworks ("lightweight models") such as Ruby on Rails, we were able to build the download tool in about a person month, a time that includes getting familiar with the Rails framework.