Pedro Ramaciotti Morales: Interdisciplinarity to better understand polarization on social media

Pedro Ramaciotti Morales and his team work at the interface of sociology, machine learning, or engineering to produce realistic characterizations of people’s political mental structures.

Pedro Ramaciotti Morales works at the interface of mathematics, computer science, sociology, and political sciences. He started to study physics and mathematics driven by his scientific curiosity, but over the years, the object of his studies shifted from pure mathematics models to sociology and politics. After a PhD in applied mathematics (Ecole Polytechnique) and a postdoctoral fellowship at the Computer Science Department of Sorbonne University, he worked as a research scientist at Sciences Po, for the Center for European Studies and Compared Politics (CEE) and later the médialab. His research interests are various, including social media, algorithmic biases, misinformation, computer science and AI, but also polarization or populism in political sciences. One of his recent projects, called “AI-Political Machines”, proposed to test whether algorithms learn and leverage political opinions of users, and how they affect information dynamics in public debate.

Another project, Social Media for Democracy (Some4Dem), focuses on the impact of social media on society with respect to political debates. In the past, Pedro Ramaciotti Morales also studied online and offline polarization in the Yellow Vests movement in France, or how different relations between Youtube channels may affect the diversity of content watched by users.

The researcher came to the Learning Planet Institute in 2022: “What interested me in the Learning Planet Institute is the diversity of stakeholders that surrounds scientists. There is a diversity of actors, from the industry to associations, or foundations, as well as an important international community.”

In the continuity of his previous studies, his project focuses on social media and politics. As he explains: “There is a long list of things that might go wrong online. People think about polarization, echo chambers, or misinformation for example. When you do scientific research about these things, you first need to understand people’s opinions, and on which these concerns might be described as research questions.” Traditionally, to analyze socio-political dynamics, many studies only consider polarization along left-right ideological dimensions. To Pedro Ramaciotti Morales, these left-right analyses have to be enriched with additional dimensions. In particular digital relational behavioral traces (what users like, comment, or recommend) can be used to mine opinions. The researcher thus works with data from Twitter, Facebook, Youtube, or Linked in, for example. Thanks to these social network data, he focuses on embedding individuals in opinion spaces where dimensions act as indicators of ideological traits of users.

pedro figures 2 Pedro Ramaciotti Morales: Interdisciplinarity to better understand polarization on social media
©Pedro Ramaciotti Morales

In a recent paper on the geometry of misinformation, he produced the first “attitudinal embedding of social network users”. He and his colleagues show, from Twitter data, that the combination of both extreme left-right polarization and anti-elite sentiments is most predictive of the propensity to share fake news.

As he says : “A lot of my research goes into trying to produce realistic characterizations of people’s political mental structures”.

The Learning Planet Institute team, called Formal Computational Socio-Politics, includes 3 PhD students (Tim Faverjon, Benjamin Gilbert, Duncan Cassells), and a postdoc (Zografoula Vagena). “They come from sociology, machine learning, or engineering. They have a fantastic mix of diverse skills that converge into the mission of the team”, Pedro Ramaciotti Morales explains.

“Our main mission, which distinguishes us from other people doing example computational social science, is that  we believe in the idea of applying mathematics to formalize problems that are deeply theoretical in the domain of social sciences”.

Pedro Ramaciotti Morales 2 Pedro Ramaciotti Morales: Interdisciplinarity to better understand polarization on social media
Pedro Ramaciotti Morales – check his Linkedin and Github profiles

Article written by Sophie Vo

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