10. An influential users identifier for identifying influential users among a group of users associated with a communication network, wherein the identifier comprises: a ranking model selection module configured to select two or more ranking models and provide scores to the users in the group using said ranking models based on usage data of the users; a calculation module configured to calculate a weighing factor for each of the selected ranking models; and an aggregate score generation module configured to identify the influential users by: generating an aggregate score for each user using the weighing factor and the score provided by each one of the selected ranking models; and comparing the aggregate score with a predefined score.
10. An influential users identifier for identifying influential users among a group of users associated with a communication network, wherein the identifier comprises: a ranking model selection module configured to select two or more ranking models and provide scores to the users in the group using said ranking models based on usage data of the users; a calculation module configured to calculate a weighing factor for each of the selected ranking models; and an aggregate score generation module configured to identify the influential users by: generating an aggregate score for each user using the weighing factor and the score provided by each one of the selected ranking models; and comparing the aggregate score with a predefined score. 12. The identifier according to claim 10 , wherein the aggregate score generation module is configured to: multiply the weighing factor of each model with the score provided by said model to a particular user so as to obtain a modified score; and add the modified scores obtained from two or more selected ranking models to obtain the aggregate score for each user.