Web 4.0 is described differently by various sources, with predictions including an immersive virtual world, connections facilitated by the network, and bringing objects online. Later concepts like Web 5.0 propose an even more integrated internet that is telepathic or incorporates time-based services. However, there is no clear consensus on what defines each iteration of an advancing web, and the terminology may continue evolving unpredictably.

1. Web 4.0 and beyond? EDU 626 Integrating Educational TechnologySummer 2011

3. Something more sober? 3 Compare Spivack’s comments in interview quoted in article “What is ‘Web 3.0,’ and should you care?” that Web 3.0 is “the third decade of the Internet.” How the WebOS Evolves? By Nova SpivackFEBRUARY 09, 2007

5. Web 3 is the brainchild of Tim Berners-Lee, largely credited for inventing the world wide web in the first place. It’s more commonly called the Semantic Web.

7. My PDA knows I’m going to a convention. Based on my email logs, it recommends who I ought to see while I’m there--because my friends have opted in to our network and we’re in sync. See more at Web45

9. Here's Tom Jenkins’ [of Canadian company Open Text]take on what Web 4.0 will bring:

10. “It’s immersive and it’s the avatar web. It will be a virtual world…”

12. CES 2010 has come and gone, but from it, it was clear that this year marks the beginning of the era of 3D entertainment.

18. Web 5.0 will scoop up all this new knowledge and the intelligence offered by Webs 2.0, 3.0 and 4.0 and deliver it in an ethical, self-aware and sentient framework, embedding all biological and artificial life within a global cooperative intelligence.