In our context communication involves people exchanging messages with people. This exchange may be direct and person-to-person (e.g. voice chat in skype) or indirect (e.g. via a message left as a post in a blog to be read at a later time by a not yet defined reader). This element includes functions and tools capable of supporting different modes of communication in terms of time (asynchronous/synchronous), location (collocated/remote), media (sound, video, text) and different Enterprise 2.0 and Collaborative Technologies communication relationships (one-to-one, one-many) and exchange can be uni-, bi- or multidirectional. [cf. Johansen 1988].