Citizen sensing: Humans as citizens on the ubiquitous Web, acting as sensors and sharing their observations and views using mobile devices and Web 2.0 Services. Citizen-sensor network: An interconnected network of people who actively observe, report, collect, analyze, and disseminate information via text, links to other resources, and various media including audio, images and videos. Social med...

Community portals such as blogs, wikis and photo sharing sites have become the new channels for information dissemination on the Web. When searching for information, many results end up in some type of community site. However, one cannot make use of the wealth of information that is available through the preferences of one's thematic social network, or through bookmarks or other documents, only...

If the World Wide Web was once an enormous library, it is now a vast conversation. Transmitting information from one person to another has never been easier and since the birth of social networking websites the methods of communication have become more diverse than ever before. Though these days many social networking sites are there having millions of existing users, there are still many diffe...

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Social networks are flourishing because of fast growing Internet and the World Wide Web, and more research efforts have been put on Social Network Analysis (SNA). A social network can be modeled like a graph, where the nodes represent persons, and an edge between them represent direct relationship between the persons. One of the issues in SNA is to identifying criminals from groups of individua...

Imagine how difficult navigating the web would be if the links between two websites had nothing to do with the content of the webpages, so that a website about the structure of the web could link to a website about salamanders. It would certainly make navigation more difficult. Unfortunately, many of the current models for the web and other social networks ignore the semantic aspects of these n...

In everyday life, we seek suggestions from people we know for deciding the best place to buy a particular good or service. In this work, we put forth a framework of an automated distributed recommendation system on a social network that exploits the widely studied concept of trust, to get personalized responses. The main contribution of our model is to combine two forms in which trust is percei...

Social Media has altered the way in which people interact, collaborate and communicate. In particular, social network sites (SNS) have grown tremendously popular and are creating new forms of Web use. The social interactive nature of SNS enables people to share cultural tastes and content across the Web. Cultural goods are hedonic experiential goods and are used in SNS as a means of acquiring a...

Social Network Sites (SNS) as a part of Web 2.0 gain increasing importance in social life. There are different types of SNS being more or less adapted to the requirements of professionals. For a selection of six SNS features and services were regarded in respect to the applicability in the professional life, using medical physicists as an example. Services as groups, calendar, literature servic...

Finding how the Semantic Web has evolved can help understand the status of Semantic Web community and predict the diffusion of the Semantic Web. One of the promising applications of the Semantic Web is the representation of personal profiles using Friend of a Friend (FOAF). A key characteristic of such social networks is their continual change. However, extant analyses of social networks on the...