Social network is a structure in which nodes are a set of social actors
that are connected together by different types of relationships. Because of the
complexity of the actors and the relationships between actors, social networks
are always represented by weighted, labeled and directed graph. Social network
analysis (NSA) is a set of techniques for determining and measuring the magnitude
of the pressure. Social network analysis is focused also on visualization
techniques for exploring the networks structure. It has gained a significant
following in many fields of applications. It has been used to examine how the
problems have been solved, how organizations interact with others, to understand
the role of an individual in an organization… In this paper, we focus on
two methods: 1- graphs visualization; 2- network analysis based on graph
vertices comparison.