This paper develops a Semantic Web application, namely WorldWideWatch or WWWatch, in short. By employment of Semantic Web technologies, WWWatch analyses and visualizes social networks between countries in the world from information extracted from online news archives. Such information is described using RDF/OWL ontology and stored in Sesame server. The social networks in this application are colored and shaded in order to represent relation polarities (i.e. positive, neutral and negative) and the confident levels of relationships among countries. Users can query social relationships of certain countries as well as related events occurred in the specified time period and display the results in different forms such as graphs and timeline diagrams. The polarities of relations are taken into account in the analysis of social networks. In addition, the proposed system can display the location of some world phenomena such as natural disasters and manifestations of global warming on a map wit...