1) There are differing views on what constitutes Web 4.0, ranging from a utopian vision of all information being benevolently connected to address all problems, to a more pragmatic focus on connections and serendipity driven by the network taking initiative.
2) Web 3.0 has been variously defined as the semantic web enabling all things to have a digital presence and footprint, the mobile/immersive web incorporating virtual worlds and augmented reality, and the next decade of the internet following Web 2.0.
3) Beyond Web 4.0, some see Web 5.0 enabling time-based services or a telepathic web interfacing directly with our brains, while others envision a "W