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We will have the semantic web working enough to base a purported 3.0 version on about two weeks before the singularity (geek rapture) happens. You'll need functional AI to pull it off. As far as markup, most people can't figure out abbr versus acronym.
Most people can't even begin to imagine the design parameters for Web 2.0. ...No, not slapping up a site and praying -- social interaction design methodology. That would be having the slightest inkling about how you actually achieve a certain pattern of social interaction so you can design with the intention of producing it.
Things like user generated content and social interaction became "build it and they will come" of the very worst sort. Mostly, users showed up sometimes and often didn't, without anyone really knowing the reason why. That's not design.
RIAs in perpetual beta quickly devolved into a convenient "get out of user testing or insight FREE" card. And a crutch to foist some really bad design on users. That's social --
socially inept -- but social. The result was
Autistic Social Software. The abusive use of beta isn't design, it's anti-user avoidance of design and so socially reprehensible.
Consequently, in practical working fact, Web 2.0 and 3.0 turn out to be fashion applied to technology. Read
Web 3.0 by Jeffrey Zeldman -- it's the closest to Web 3.0 most people will see.
This is coming from someone hired to develop Internet II (the ultra high speed net connecting universities) applications for fostering a social interaction design pattern called
The Medici Effect.
You've never heard of it because "throw it at the user and see what sticks" has replaced any clue about interaction design. Social interaction patterns that "just kinda happen" isn't design. Projects that banter endlessly about the technology and not the user result are just tacking on trendy gimmicks, not design.
Design involves the human result
you intended to achieve, not the stuff that just happens. Most design firms might as well be discussing the metabolism of unicorns as discuss Web 2.0 and the social web.