Definitions of Web 1.0, 2.0, 3.0

To be honest, I had no idea that there are different stages of web. I thought the web was the web and as time passes technology and stuff improves, but I didn't know the web was considered different stages. I guess in the time I live in now and what I'm grown up with technology wise and the way social networks have taken over makes sense.
It's very scary to think that we are possibly "training" machines. The way technology keeps improving anything is possible. I mean in this we have a blog, using a social network to display work and communicate our assignments, instead of turning in a paper or something.
What's also scary to me I think is that what ever you put out on the internet can never ever be erased. It will be out there forever. I never really put that much thought into the web being intrusive and stuff like that, but yes the web is and always will be. I think with anything there are always two sides to a story, the web is great for a lot of things, makes life easier with being able to do so much. On the other hand having so much of your life exposed through social networks and knowing it's out there forever and anyone could find that information is unsettling.
I think there will always be advantages and disadvantages to using the web just depending on how people use the resource.  

Definitions: 

Web 1.0 - Web 1.0 refers to the first stage in the World Wide Web, which was entirely made up of Web pages connected by hyperlinks. Although the exact definition of Web 1.0 is a source of debate, it is generally believed to refer to the Web when it was a set of static websites that were not yet providing interactive content. In Web 1.0, applications were also generally proprietary.

Web 2.0 -
Web 2.0 is term that was introduced in 2004 and refers to the second generation of the World Wide Web. The term "2.0" comes from the software industry, where new versions of software programs are labeled with an incremental version number. Like software, the new generation of the Web includes new features and functionality that was not available in the past. However, Web 2.0 does not refer to a specific version of the Web, but rather a series of technological improvements.
Some examples of features considered to be part of Web 2.0 are listed below: Blogs, Wikis, Social networking, web applications.

 Web 3.0 -
However, in the context of Web 3.0, they take center stage. By combining a semantic markup and web services, the Web 3.0 promises the potential for applications that can speak to each other directly, and for broader searches for information through simpler interfaces.