BPCPPDYSOE21 – scientific program

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SOE: Fachverband Physik sozio-ökonomischer Systeme

SOE 3: Poster

SOE 3.7: Poster

Monday, March 22, 2021, 17:30–19:30, SOEp

Cascade dynamics in Reddit communities — •Joao Pinheiro Neto and Knut Heidemann — Max Planck Institute for Dynamics and Self-Organization

Social media has a large role in modern society, making studying its dynamics fundamental to understand social and political events. Reddit is one of the biggest social media platforms in the world, and individual subcommunities (called "subreddits") have been involved in some of the biggest events in recent times. Discussions in Reddit happen in threads that follow a tree structure, with each comment spawning a new branch. This has been modeled with directed percolation-like models such as the Hawkes process, and it has been shown that the probability distributions of both thread size and total score follow power-laws [1,2]. Here we explore how these distributions and other observables vary across different subreddits. In particular, we show that i) subreddits can display both power-laws and non-power-law distributions, and ii) that the measured power-law exponents can vary considerably. We relate that to subreddit features such as the type of content and size of the userbase.


1. Medvedev, A. N., Delvenne, J. C., Lambiotte, R., & Cherifi, H. (2018). Journal of Complex Networks, 7(1), 67*82

2. Medvedev, A. N., Lambiotte, R., & Delvenne, J.-C. (2019) In Springer Proceedings in Complexity (pp. 183*204).

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