“…General model of a social tagging system is represented as a hyper-graph structure called folksonomy where the set of nodes consists of three kinds of objects: users, resources and tags, and hyper-edges connect these objects based on their relations [2]. The folksonomy can be defined with a quaternary structure F = (U, T, R, P ), where U represents the set of users u in the system, T is the set of tags t posted by users, R shows the set of resources r and P defines the relation existing between tags, users, and resources.…”