The meaning of the term Web 2.0 has evolved over time, but it has come include social media as a major component. Although community has always been a part of the Web, new Web applications such as AJAX and more modern browsers began providing opportunities for people to express themselves online as never before, and to combine applications to create a more integrated Web. By 2005, the term Web 2.0 was well-established, and companies such as Google made huge strides to integrate information online. For example, a website that reviews restaurants may use social media, user-generated content, photographs from Flickr, Google maps, and content from around the Web to create a more complete user experience.
To a certain extent, Web 2.0 is just an overused buzzword. On the other hand, there is a genuine difference between the "brochure-ware" websites in the early 90s versus the rich web apps of the modern Web.
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