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Information diffusion in distributed OSN: The impact of trusted relationships

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Abstract

Distributed Online Social Networks (DOSN) are a valid alternative to OSN based on peer-to-peer communications. Without centralised data management, DOSN must provide the users with higher level of control over their personal information and privacy. Thus, users may wish to restrict their personal network to a limited set of peers, depending on the level of trust with them. This means that the effective social network (used for information exchange) may be a subset of the complete social network, and may present different structural patterns, which could limit information diffusion. In this paper, we estimate the capability of DOSN to diffuse content based on trust between social peers. To have a realistic representation of a OSN friendship graph, we consider a large-scale Facebook network, from which we estimate the trust level between friends. Then, we consider only social links above a certain threshold of trust, and we analyse the potential capability of the resulting graph to spread information through several structural indices. We test four possible thresholds, coinciding with the definition of personal social circles derived from sociology and anthropology. The results show that limiting the network to “active social contacts” leads to a graph with high network connectivity, where the nodes are still well-connected to each other, thus information can potentially cover a large number of nodes with respect to the original graph. On the other hand, the coverage drops for more restrictive assumptions. Nevertheless the re-insertion of a single excluded friend for each user is sufficient to obtain good coverage (i.e., always higher than 40 %) even in the most restricted graphs. We also analyse the potential capability of the network to spread information (i.e., network spreadability), studying the properties of the social paths between any pairs of users in the graph, which represent the effective channels traversed by information. The value of contact frequency between pairs of users determines a decay of trust along the path (the higher the contact frequency the lower the decay), and a consequent decay in the level of trustworthiness of information traversing the path. We show that selecting the link to re-insert in the network with probability proportional to its level of trust is the best re-insertion strategy, as it leads to the best connectivity/spreadability combination.

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Notes

  1. http://current.cs.ucsb.edu/socialnets/

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Acknowledgments

This work was partly funded by the EC under the EINS (FP7-FIRE 288021), MOTO (FP7 317959), and EIT ICT Labs MOSES and oT content (Business Plan 2015) projects.

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  1. IIT-CNR, Via G. Moruzzi 1, 56017, Pisa, Italy

    Valerio Arnaboldi, Massimiliano La Gala, Andrea Passarella & Marco Conti

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  1. Valerio Arnaboldi
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  2. Massimiliano La Gala
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  3. Andrea Passarella
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  4. Marco Conti
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Correspondence to Valerio Arnaboldi.

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Arnaboldi, V., La Gala, M., Passarella, A. et al. Information diffusion in distributed OSN: The impact of trusted relationships. Peer-to-Peer Netw. Appl. 9, 1195–1208 (2016). https://doi.org/10.1007/s12083-015-0395-2

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