Our experiments have shown Web 2.0 services indeed stimulate active participation (principle "individual creativity"). Participation in the micro-blogging service was high and continues until four months after the lecture has finished. Usability of the services was judged as being rather good. About 75% of the microblogging users reported that registration and usage of the service was easy. This supports our claim that using existing Web 2.0 services can hold advantages since the burden of designing an easy to use interface is taken from the researcher.