Abstract
This paper is part of a series of proposals for using logic to analyse social networks. It studies the intertwining of two forms of information dynamics: social influence, through which an agent’s behaviour, opinions or features are affected by those of her social connections, and friendship selection, through which an agent chooses her social connections based on their common behaviour, opinions or features. The text provides a logical analysis of the two forms of dynamics (the main ingredients in the phenomenon known as homophily) as well as of their interaction, discussing also some of their variations.
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Notes
- 1.
- 2.
It will be useful to consider the ‘dual’ function , returning the set of positions each agent \(\mathtt {i}\in \varvec{\mathcal {A}}\) holds on topic \(T \in \varvec{\mathcal {T}}\), and defined as .
- 3.
Definition 4.3 presents an alternative in which an agent’s new stance on topic T depends on the stances of all the agents to which she is socially connected, regardless of whether it is on topic T or on another.
- 4.
- 5.
The labels of the diagrams are as in Item (i) through the whole Example.
- 6.
Consider a one-topic case with positions \(\{ p,q \}\) and agents \(\{ \mathtt {a}, \mathtt {b}, \mathtt {c} \}\), their initial positions being and the initial network being just reflexive edges. The repetition of(i) social influence with \(\tau \,{=}\,1\) (no effect), (ii) friendship selection with (adding only symmetric edges between \(\mathtt {b}\) and both \(\mathtt {a}\) and \(\mathtt {c}\)), (iii) social influence now with (no effect) and (iv) friendship selection now with \(\theta \,{=}\,1\) (removing the just added edges) does not stabilise.
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For contrast, a parallel composition, affecting both agents and social networks at once, would require a new modality.
- 8.
In modal languages cases, one could work directly with a semantic characterisation of the language’s expressivity, i.e., with some form of bisimulation [27, Section 2.2].
- 9.
Again, although not shown, the labels of the diagrams are as in Item (ii) through the whole Example.
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Smets, S., Velázquez-Quesada, F.R. (2020). A Logical Analysis of the Interplay Between Social Influence and Friendship Selection. In: Soares Barbosa, L., Baltag, A. (eds) Dynamic Logic. New Trends and Applications. DALI 2019. Lecture Notes in Computer Science(), vol 12005. Springer, Cham. https://doi.org/10.1007/978-3-030-38808-9_5
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