panta rhei — everything grows. These two words where used by Plato to subsume the study of his colleague Heraklit, who argued that the world is a permanent becoming and vanishing, in which everything constantly changes. This also applies to the area of Web2.0, which revolutionized the WWW and transformed it into a more social, user friendly, emergent, and flexible network, in which users have become media producers and web applications became more open as well as social, while at the same time improving their mutual integration.