However, we could also observe that unconstrained active participation results in distraction: e. g., in the micro-blogging service, students posted messages in other languages than English. Additionally, some users seemed not to be aware (or not to care) that their messages were readable by all other users and posted pejorative messages ("I'm too fat", "My boss is an idiot"). It is therefore important to note that although Web 2.0 applications fulfill their goal of stimulating participation, their usage in a classroom does not relieve the teacher of his role as a moderator.