The Web 2.0 movement was about opening up the data in computer consumable formats and APIs. Nothing more.
While exchanging data over the internet is obviously nothing new, having large organizations provide easy programmable access to their private databases was somewhat revolutionary. The whole App craze was born out of being able to create new interfaces to existing services, thanks to Web 2.0.
Web 2.0 was nothing new from a technical perspective, but it was a revolutionary social shift.
Web 2.0 for me was mainly about user-generated content like blogs, wikis, social networking etc.
You could do a lot if not all of that before as a tech and not-so-much tech but chances were that you did not. "Blog" made it hip and cool for everyone to write a lot about usually not a lot - but if you wanted to have a website you could very well do so before.
I assume you mean RSS and what followed the blogs back then - but this was not really the main idea of Web 2.0. Web services were happening at the same time but they are not "the" web 2.0, in my opinion.
While exchanging data over the internet is obviously nothing new, having large organizations provide easy programmable access to their private databases was somewhat revolutionary. The whole App craze was born out of being able to create new interfaces to existing services, thanks to Web 2.0.
Web 2.0 was nothing new from a technical perspective, but it was a revolutionary social shift.