A video discussing the semantic web (as some call Web 3.0) - this is still being discussed, however, with personal assistants (Siri) and the ability to communicate to increasingly intelligent devices that access the web, it is likely that some of the technologies we have today are transitional technologies that are transporting us from Web 2 to Web 3 as we speak. Remember, however, that although we are moving ahead, that the characteristics of previous "webs" are still there. We can still search like we did in Web 1 and we are certainly seeing explosive growth in social media (Web 2) but Web 3 is here. I think this video is a nice explanation.
"Virtual Assistants have been with us for a while and many of us have had experiences similar to the dialogue above. However, they are getting better and becoming more of an assistant than a hindrance. Apple, Google, Microsoft and Amazon all have voice activated assistance. I've used them all at different times for my personal use, especially Google Now, but Amazon's Alexa assistant is the only one I've used in the classroom via an Amazon echo. Many of the following ideas can be done on any of the above assistants, but I will focus on Amazon's Alexa."