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What is Web2.0? A perceived second generation of web-based communities and hosted services – such as social-networking sites, wikis and folksonomies – which aim to facilitate collaboration and sharing between users. Although the term suggests a new version of the World Wide Web, it does not refer to an update to any technical specifications, but to changes in the ways software developers and end-users use the web. http://en.wikipedia.org/wiki/Web2.0
Mashups A mashup is a web application that combines data from more than one source into a single integrated tool….thereby creating a new and distinct web service that was not originally envisaged by either source. http://en.wikipedia.org/wiki/Mashup_%28web_application_hybrid%29
Social networking A social network service focuses on the building and verifying of online social networks for communities of people who share interests and activities, or who are interested in exploring the interests and activities of others, and which necessitates the use of software. Most social network services are primarily web based and provide a collection of various ways for users to interact, such as chat, messaging, email, video, voice chat, file sharing, blogging, discussion groups, and so on. http://en.wikipedia.org/wiki/Social_networking
The main types of social networking services are those which contain directories of some categories (such as former classmates), means to connect with friends (usually with self-description pages), and recommender systems linked to trust. Popular methods now combine many of these, with MySpace, Bebo and Facebook being the mostly widely used in 2007. http://en.wikipedia.org/wiki/Social_networking