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Web 2.5 will be about creating safe, supportive, and effective places for structured collaboration to take place: "Safe" will mean not only that information contributors are protected by mechanisms that insure that "only people who should see x, see x", but also that there are mechanisms to appropriately build trust in those contributors among consumers of the information.  Seller ratings on eBay are the poster child for what's meant here.  A prediction -- we're bound to see, at some point, a "portable online credibility profile service" that is analogous to a financial credit rating.  People with an interest in being perceived to be credible online will register their personas on different sites with a third-party service, credibility ratings of these personas will be aggregated (scraped or parsed at minimum if APIs or RSS extension feeds aren't there for this), and as liquidity builds in such a service, sites will incorporate this into their platforms (as Truste vouches for the security of a site, these services will vouch for the reputations of participants in a site).  At an even more technical level, platforms must and will evolve to support complex "subsite" structures with sophisticated permissioning schemes.  .LRN provides a good example of an advanced architecture for this. "Supportive" will mean that both contribution and consumption of information is coached and encouraged.  Assuming "safe", many more people could be using blogs to share information to their own and their colleagues' and friends' benefit, but they may feel awkward or unsure about Why/ what/ how.  Well designed applications will provide not just "defense-in-depth" help mechanisms for when people have problems, but more extensive tours and ongoing coaching for users as they progress from new to more experienced in their familiarity with the system.  For example, earlier incarnations of the ArsDigita Community System featured a "Curriculum System" module to help people track what they've already learned and what they still need to know to use a system effectively (See http://philip.greenspun.com/doc/curriculum.html). "Effective" will mean that the contribution and consumption of information in applications is made both simple and obvious.  Applications like our restaurant review experiment are especially useful because the information is easy to contribute (the provided structure prompts, but is flexible enough to accomodate orthogonal descriptions) and consume (the data can be viewed geospatially on the map, or via different sort options).

In summary, for me Web 1.5 was all about the realization that the real value of the Web for business lies in supporting and leveraging collaboration, not simply opening up a new channel for transaction.  The keys to doing this well:  focus "communities" on high-value exchanges; structure communities so logical subgroups based on powerful affinities can be created maintained, and easily extended -- not only by site sponsors, but by community members as well; support users through the "why" and the "what" of collaborating, not just the "how"; and, make contribution and consumption of the information as easy as possible. 

Web 1.0 – Centralised Them. Web 2.0 – Distributed Us. Web 3.0 – Decentralised Me

Web 1.0 turned into a broadcast medium. It was all about them. A case of industrial age thinking applied to a new landscape.

Web 2.0, largely based on an analysis of what worked in Web1.0, is an alignment with TBL’s initial vision of the Web. The Web as connective tissue between us. Platform, participation and conversation. Really it is more than the Web. It is the Internet. It is new practices too. Ultimately it is about connectivity; applying constrains in the form of some sort-of agreed upon standards that make it easier to talk to one another. With new layers of connective wealth come new tools. In Web2.0’s case that allowed new forms of communication. With it associated ‘acceptable’ business models – hence the Google economy.

“Web 2.0 can be defined as “the philosophy of mutually maximizing collective intelligence and added value for each participant by formalized and dynamic information sharing and creation.”

Web 1.5 is where the information is conveyed differently by the industry practitioner, but the industry practitioner doesn’t understand that .5 of the “added value” comes from the commenter who disagrees with the post or adds more info than the post itself conveys

WEB 1.0 is a commercial - a one sided mirror. WEB 2.0 is an exchange of ideas where the general public is not the “reader” only, or the one “information is conveyed TO“, but the most important part of the information process and where the “added value” comes from.