 These are started by individuals with a particular interest in a subject who may begin by posting information and providing the means for online discussion.Granovetter's work (1973) proved to be crucial in the individualistic approach of the social network theory as seen by the number of references in other papers.His argument asserts that weak ties (acquaintances, according to Granovetter, 1973; 1983) are less likely to be involved within the social network than strong ties (close friends and family).