Today Social Networks or Social Media Networks are getting popularity like anything and Web 2.0 is the best standard to develop them. Web 2.0 is a technology that is generally associated with the web applications. Web 2.0 is the term given to describe a second generation of the World Wide Web. Web 2.0 basically refers to the transition from static HTML Web pages to a more dynamic Web that is more organized and is based on serving Web applications to users.
Web 2.0 is a description of a range of web services that collectively represents the ‘second version’ of the world wide web. There is no definitive list of such services (not even a definitive list of the types of service that make up Web 2.0), but they all have certain characteristics in common: web (rather than PC) based user control of data (rather than the data being owned by the hosting service) user-friendly and interactive environment collaborative/participatory facilities Web 2.0 is better described by example than definition. Services such as Googlemail, Wikipedia and Flickr exhibit clear Web 2.0 characteristics.