Organizing users’ friends in personal social networks, i.e., ego networks, into circles is an important task for online social networks. Social networking sites allow users to manually categorize their friends into social circles. However, it is time consuming and does not update automatically as a user adds more friends. In this paper, we propose an edge-based clustering algorithm to detect so...

A geometric inequality among three triangles, originating in circle packing problems, is introduced. In order to prove it, we reduce the original formulation to the nonnegativity of a particular polynomial in four real indeterminates. Techniques based on sum of squares decompositions, semidefinite programming, and symmetry reduction are then applied to provide an easily verifiable nonnegativity...

Location-Based Services (LBSs) are becoming more social and Social Networks (SNs) are increasingly including location components. Geo-Social Networks are bridging the gap between virtual and physical social networks. In this paper, we propose a new type of query called Circle of Friend Query (CoFQ) to allow finding a group of friends in a Geo-Social network whose members are close to each other...

On-line Social Networks (OSN) have become one of the most used Internet services. However, as happens with every new technology, they are prone to several security issues. Despite privacy concerns begin to emerge, there are still other dangerous vulnerabilities that affect security and threaten organisations and users assets. In this paper, we present the first Threat Modelling approach in Onli...

With the advent and popularity of social network, more and more users like to share their experiences, such as ratings, reviews, and blogs. The new factors of social network like interpersonal influence and interest based on circles of friends bring opportunities and challenges for recommender system (RS) to solve the cold start and sparsity problem of datasets. Some of the social factors have ...

In this paper we study the quantity E supt∈T Xt, where Xt is some random process. In the case of the Gaussian process, there is a natural sub-metric d defined on T . We find an upper bound in terms of labelled-covering trees of (T, d) and a lower bound in terms of packing trees (this uses the knowledge of packing numbers of subsets of T ). The two quantities are proved to be equivalent via a ge...

Land is a kind of basic resources and of great importance to the survival and development of human beings. Due to the conflict between the limited amount of land and the unlimited development of human beings, land surely plays a significant role in national security and social development. The academic circle has introduced the social stability price to the pricing system of farmland, which ref...

On today’s date 4 out of 5 people use the social networking sites for their social relationship buildings and be connected with their loved ones and friend circle. They use the social sites for sharing their updates. The social networking sites may provide the user’s own space to share the contents and in company with that the privacy policies also. But there is a trouble of privacy and securit...