Constructivism sees learning as activity that takes place in a social context [41]. Thus generally speaking, these innate properties of Web 2.0 services are beneficial for learning. An obvious example is learning of a foreign language. In Section 3.1 we describe how we used micro-blogging, i.e., SMSlike news exchange between users, for learning English as a second language. The large community of pre-existing users of this service allowed the learners to observe communication of native speakers and to practice by communicating with other users who were no member of the class.