Web services make software functionality available over the internet so that programs like PHP, ASP, JSP, JavaBeans, the COM object and all our other favorite widgets can make a request to a program running on another server (a web service) and use that program's response in a website, WAP service or other applications. The social opportunities that members experience are really the best for their age and condition. In order to do so, various web applications and services are enabled to know more than more about what happens beyond the walls, bring people who care to interact with them side by side and develop. Essentially, it is social media for people than websites. The present book has discussed various aspects such as Web 2.0 and recent developments; online social communication and innovations; social networking tools and libraries; instant messaging and services in libraries; Library 2.0; RSS applications; Ajax technologies; blog and bolgging; Enterprise 2.0 and semantic web and information retrieval in the division of ten chapters. Web based social networking services are self describing, modular software components made available to other applications using public networks, standardized languages and transported via commonly available internet technologies.