One of the key questions of contemporary society is how to foster and develop social interactions which will lead to a strong and inclusive society, one which accounts for the diversity inherent in local communities, whether that diversity be based on differences in interest or diversity in language and culture. The purpose of this paper is to examine three concepts which are used in the exploration of social interactions to suggest ways in which the interplay of these concepts might provide a richer understanding of social interactions. The three concepts are everyday cosmopolitanism, complexity theory and social capital. Each provides a partial approach to explanations of social interactions. Through focussing on social networking as a significant example of social interactions, we will demonstrate how the concepts can be linked and this linking brings potential for a clearer understanding of the processes through which this inclusive society may develop.One of the key questions of contemporary society is how to foster and develop social interactions which will lead to a strong and inclusive society, in short, a rich diverse cosmopolitan community in which people of diverse ethnic and other backgrounds interact and interconnect within the everyday life of the community. While we know that such an ideal cosmopolitan community is possible, and sometimes indeed occurs, we also know that this may be the exception rather than the rule in local communities. The question then becomes, if such a cosmopolitan community is possible, how does it occur? By what processes can we identify the formation of cosmopolitan networks? In order to answer these questions, we need to follow the process that begins with the casual interaction between strangers, the initial interaction between two or more individuals of different ethnic (or other) backgrounds. While many, perhaps most, of these interactions go no further, some may be