Web-based applications and desktops Ajax has prompted the development of websites that mimic desktop applications, such as word processing, the spreadsheet, and slide-show presentation. In 2006 Google, Inc. acquired one of the best-known sites of this broad class, Writely.  WYSIWYG wiki and blogging sites replicate many features of PC authoring applications. Several browser-based operating systems have emerged, including EyeOS and YouOS.(No longer active.) Although coined as such, many of these services function less like a traditional operating system and more as an application platform.
They mimic the user experience of desktop operating-systems, offering features and applications similar to a PC environment, and are able to run within any modern browser. However, these so-called “operating systems” do not directly control the hardware on the client’s computer. Numerous web-based application services appeared during the dot-com bubble of 1997–2001 and then vanished, having failed to gain a critical mass of customers. In 2005, WebEx acquired one of the better-known of these, Intranets.com, for $45 million
Distribution of media
Many regard syndication of site content as a Web 2.0 feature. Syndication uses standardized protocols to permit end-users to make use of a site’s data in another context (such as another website, a browser plugin, or a separate desktop application). Protocols permitting syndication include RSS (really simple syndication, also known as web syndication), RDF, and Atom, all of them XML-based formats. Observers have started to refer to these technologies as web feeds. Specialized protocols such as FOAF and XFN (both for social networking) extend the functionality of sites or permit end-users to interact without centralized websites.
Web 2.0 often uses machine-based interactions such as REST and SOAP. Servers often expose proprietary Application programming interfaces (API), but standard APIs (for example, for posting to a blog or notifying a blog update) have also come into use. Most communications through APIs involve XML or JSON payloads
Critics of the term claim that “Web 2.0” does not represent a new version of the World Wide Web at all, but merely continues to use so-called “Web 1.0” technologies and concepts. First, techniques such as AJAX do not replace underlying protocols like HTTP, but add an additional layer of abstraction on top of them. Second, many of the ideas of Web 2.0 had already been featured in implementations on networked systems well before the term Web 2.0 emerged.
Amazon.com, for instance, has allowed users to write reviews and consumer guides since its launch in 1995, in a form of self-publishing. Amazon also opened its API to outside developers in 2002. Previous developments also came from research in computer-supported collaborative learning and computer supported cooperative work (CSCW) and from established products like Lotus Notes and Lotus Domino, all phenomena that preceded Web 2.0.
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