If Web 2.0 is "a set of principles and practices that tie together a veritable solar system of sites" as Tim O'Reilley (2005) says, then where is the theory to ground the principles? With the speed at which technological innovations change, who is to predict what our favourite web 2.0 will be in a couple of years?
What I agree with O'Reilley (2005) about is when he says that "that the web is more important today than ever, with exciting new applications and sites popping up with surprising regularity". This prediction made in 2005 is so true and that might just confirm to us that we do not know what our favourite web 2.0 will be in a couple of years.
Reference
What Is Web 2.0: Design Patterns and Business Models for the Next Generation of Software.
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http://fredahtech.pbworks.com