The evolution of multi-agent systems theories and technologies has important relationships with the evolution of social networks. In fact, the study of social structures such as organizations and coalitions is one of the most important topics of the research on multi-agent systems; while such a study can take advantage of the works on social network analysis, multi-agent systems can be used both for simulating the evolution of social networks and for providing technological supports for the realization of services for such kinds of networks. This chapter has the goal of describing the relationships between multi-agent systems and social networks and how multi-agent systems technologies and techniques have been used and can be used in support of social networks.

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Online social networks have changed the way people interact, allowing them to stay in touch with their acquaintances, reconnect with old friends, and establish new relationships with other people based on hobbies, interests, and friendship circles. Unfortunately, the regrettable concurrence of the users' carefree attitude in sharing information, the often sub-par security measures from the part of the system operators and, eventually, the high value of the published information make online social networks an interesting target for crackers and scammers alike. The information contained can be used to trigger attacks to even more sensible targets and the ultimate goal of sociability shared by the users allows sophisticated forms of social engineering inside the system. This work reviews some typical social attacks that are conducted on social networking systems, carrying real-world examples of such violations and analysing in particular the weakness of password mechanisms. It then presents some solutions that could improve the overall security of the systems.

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Participation in social networks has long been studied as a social phenomenon according to different theories. In particular, the notion of social capital highlights a person's benefit due to his relations with other persons, including family, colleagues, friends and generic contacts. It may be important both for the individuals that are able to accumulate large amounts, and for organizations. Nowadays, social networking systems bring many acquaintances online, both in the private and working spheres. Some systems are used both at home, for leisure goals, and on the work place, professionally. In the vast majority of cases, social networking platforms are still used without corporate blessing. However, several traditional information systems, such as CRMs and ERPs, have also been modified in order to include social aspects. This article shows the role of social capital in the participation in online social networking activities, in the various cases of Virtual Organizations, Virtual Teams, and online Networks of Practice. It describes the present situation, which is characterized by great promises and mixed initial results, and some possible prospects.