Berlin 2018 – scientific programme
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SOE: Fachverband Physik sozio-ökonomischer Systeme
SOE 23: Complex Contagion Phenomena II (Focus Session with EPS-SNPD) (joint session SOE/DY/BP)
SOE 23.7: Talk
Friday, March 16, 2018, 11:30–11:45, MA 001
Complex contagion in social media — •Philipp Lorenz1, Jonas Braun2, and Philipp Hövel1 — 1Institute of Theoretical Physics, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany — 2Department of Physics, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
Spreading processes on a network of individuals can be described either under the assumption of independent interaction with equal transmission rates, like the classic SIS/SIR models (simple contagion) or one can take the structure of an individual’s neighborhood into account (complex contagion). A very interesting model is sociologically inspired and includes the relative threshold of a node’s surrounding required to change its state to infected (convinced). For the online world, especially social platforms, which became the stage of opinion spreading, these models have to be extended. We propose two extensions of the classical threshold model:
- Reposting, the state of a node can be multiple infected (convinced) changing the binary state variable to an integer.
- Recovery, a saturation of exposure, introducing a second threshold that turns nodes into a recovered (immune) state.
We investigate the interplay of these ingredients, separated and in combination with respect to the spreading dynamics and the role of initiators by the quantitative comparison of various scenarios.