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Tim O’Reilly coined the term Web 2.0 to indicate a new phase of the Internet.
Andrew Keen writes in his book The Cult of the Amateur critical of free, user-based information-gathering sites such as Wikipedia. Alternatively, it refers to Citizendium Larry Sanger. The criticism of Wikipedia states that any amateur or layman can add content without checked or edited by someone with a thorough knowledge of the relevant area.

Web 2.0 refers to the development of the Internet to an interactive medium which can also upload a normal user information and not just download. Internet guru Tim O’Reilly coined the term and situates the wrap around 2001, after the bursting of the Internet bubble of the Web 1.0. On that initial popularity of the Internet heard a ‘new’ economic euphoria that ended in the late nineties dotcom hype. Web 2.0 is not a synonym for the semantic web, as is sometimes assumed.

content

     1 Everyone author
     2 For and against
     3 Technique or attitude?
     4 Reliability
     5 Profile
     6 Changes in time
     7 See also
     8 External links
     9 Bibliography

everyone author

With Web 2.0, determine the Internet with the content that appears on the internet and they increase as the interactive nature of the Web. This user-generated content is gathered on social networking sites such as Hyves Dutch or Belgian Netlog, weblogs, wikis, podcasts, RSS feeds, web and web services with open APIs. Examples of applications are Reddit, YouTube, Facebook, Dailymotion, Flickr, Panoramio, Netvibes, Orkut, Myspace, Last.fm, Delicious, Digg, Pandora, Wikipedia and Twitter.

Many Web 2.0 sites are continuously expanded and changed and linger in the development or beta version. Sometimes to the chagrin of the users who are constantly on all changes (which are not always improvements) must adapt. For most of these sites is that they are free and in “exchange” for that much information about their users gather for the sake of commerce. Here the rule is that where things are free, you are the product.
For and against

Advocates of Web 2.0, the founder of Wikipedia Jimmy Wales, the digital activist and educator Ndesanjo Macha, the philosopher Charles Leadbeater. The author Andrew Keen and the former editor of the Encyclopædia Britannica, Robert McHenry view the interactive Internet rather skeptical.
Technique or attitude?

Where Web 1.0 uses simple HTML, extends the Web 2.0 technique with XML, JavaScript and server side scripting (usually in the form of PHP). Web 2.0 is an interactive communication medium. Interactive applications are often designed with AJAX, which uses XHTML, CSS, Document Object Model (DOM), XML, XSLT and JavaScript XMLHttpRequest. Ajax gives users the feeling that they are working with a desktop application. Ajax communicates with a web server, often servers that have installed a scripting language like PHP, JSP, ColdFusion or Ruby. If the server then sends a response that both XML and JSON as HTML can be, JavaScript uses a portion of the page. An early site that Ajax and used as a typical Web 2.0 site is seen, Google’s Gmail.
reliability

The abundance of information that this has occurred, is not always reliable. News on Twitter are written from the point of view of the spectator. More than traditional journalism applies to Twitter “one source is not a source.” Skeptics see this as a disadvantage of Web 2.0: the lack of academic credentials. Nevertheless, as compared to a peer review system that would lead to refinement and correction. Wikipedia is a common example: everyone is free to edit and improve.
profile

Ask the interactive sites again and again creating a profile. An online profile or not showing through nicknames who is a user. The many log is sometimes a bottleneck: the various profiles, nicknames, passwords and digital identities are perceived as impractical. Identity 2.0 services such as OpenID and Windows CardSpace link Web 2.0 websites and provide the user with a single login. Opponents see dangers in accommodating all these data in a single batch.
Development over time

     1993: Al Gore speaks metaphorically about Internet with the ‘information superhighway’
     1998: Google
     2001: Wikipedia
     2005: YouTube
     2006: Twitter
     2008: Facebook (NL)

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