Manoel Horta Ribeiro



I'm an incoming Assistant Professor at Princeton University in the Department of Computer Science, affiliated with the Princeton Center for Information Technology Policy (CITP). Let's work together, see «Advising». I received my doctoral degree in Switzerland, at EPFL’s DLAB, working with Bob West, and my MSc and BSc in Brazil, at UFMG. During my doctorate, I worked closely with several companies, including Meta, Reddit, Prolific, and Microsoft.

I work at the intersection of computational social science, artificial intelligence, and social computing. I like doing research that tackles real-world issues and provides actionable insights. Ideally, these insights translate into policy and design changes. My work has also received extensive media coverage, helping shape the public debate around online platforms and generative AI; see «Press».

2024-06-06 🏆 Went to ICWSM, our paper (led by Peppe) won the best paper award! Hurray! (photo)
2024-04-30 🎬 Gave a talk at the Social Computing Group at the University of Zürich — and took no pictures :(.
2024-04-23 🎓 Successfully passed my thesis defense! (photo)
2024-03-28 🎬 Gave a virtual talk at TeDCog Lab (link)
2024-03-08 🎬 Gave a talk at University of Washington (link) (photo)
2024-03-04 🎬 Gave a talk at Princeton (link)
2024-02-28 🎬 Gave a talk at Cornell (photo)
2023-10-13 🤕 I hit the job market (link)
2023-06-13 ☀️ This summer I'll work with Sid Suri and Teny Shapiro at Microsoft Research (photo)
2023-06-07 🎬 Presented our paper on "The Amplification Paradox in Recommender Systems" at ICWSM! Peppe and Tiancheng also presented other work I was involved with! (photo)
2023-02-07 🎬 Presented our paper on content removals at WWW! (link)
2023-03-15 📜 Three papers accepted at ICWSM 2023: "The Amplification Paradox in Recommender Systems", "Quotatives Indicate Decline in Objectivity in US Political News", and "Spillover of Antisocial Behavior from Fringe Platforms: The Unintended Consequences of Community Banning" (link) (link) (link)
2023-03-07 🏆 I am in Forbes’ 30 Under 30 Class of 2023 in Science & Healthcare (Europe) (link)
2023-02-07 🎬 Gave a talk at the Raditube Workshop at Tec de Monterrey (link)
2023-01-31 📜 Paper accepted at WebSci 2023: "Understanding Online Migration Decisions Following the Banning of Radical Communities" (link)
2023-01-25 📜 Paper accepted at TheWebConf 2023: "Automated Content Moderation Increases Adherence to Community Guidelines" (link)
2022-12-16 🏆 I have received a Teaching Assistant Award at EPFL (photo)
2022-12-08 🎬 Gave a talk at the ETH Chair of Systems Design (photo)
2022-12-07 🎬 Gave an online talk at UFMG (photo)
2022-07-20 🎬 Two oral presentations and two posters at IC2S2 2022! (photo)
2022-06-15 🎬 Gave a second talk at Google Zurich (photo)
2022-06-09 🏆 I have received a Best Reviewer Award at ICWSM 2022! (link)
2022-06-07 🎬 Presented our paper on post approvals at ICWSM! (link)
2022-05-09 🎬 Gave a talk at the ETH Immigration Policy Lab (link)
2022-03-30 📜 Paper accepted at Websci 2022: "Analyzing the Sleeping Giants Activism Model in Brazil" (link)
2022-03-18 📜 Paper accepted at CSCW 2022: "Characterizing Alternative Monetization Strategies on YouTube" (link)
2022-03-30 📜 Paper accepted at ICWSM 2022: "Post approvals in online communities" (link)
2021-11-02 📜 Paper out at Nature Scientific Reports: "Volunteer contributions to Wikipedia increased during COVID-19 mobility restrictions" (link)
2021-10-25 🎬 Presented our deplatforming work at CSCW (link)
2021-10-14 🏆 "Do Platform Migrations Compromise Content Moderation" received a Best Paper Honorable Mention Award at CSCW 2021 (link)
2021-08-25 📜 Paper out at Nature Communications: "Deep neural network-estimated electrocardiographic age as a mortality predictor " (link)
2021-06-27 🎬 Presented our deplatforming and our Wikipedia + COVID-19 work at IC2S2
2020-02-13 🎬 Gave a talk at MILA (governance of AI discussion group)
2021-06-08 🎬 Presented a couple of papers at ICWSM2021 in gather.town (photo)
2021-06-07 ☀️ This summer I'll work with Justin Cheng @ Facebook
2021-04-23 🏆 I have received a Facebook fellowship award to continue my ongoing work on understanding and improving our information ecosystem (link)
2021-04-13 📜 Paper accepted at WebSci 2021: "Are Anti-Feminist Communities Gateways to the Far Right? Evidence from Reddit and YouTube (link)
2021-03-24 📜 Paper accepted at CSCW 2021: "Does Platform Migration Compromise Content Moderation? Evidence from r/The_Donald and r/Incels" (link)
2021-03-19 📜 Dataset paper accepted at ICWSM 2021: "YouNiverse: Large-Scale Channel and Video Metadata from English-Speaking YouTube" (link)
2020-11-20 🏆 My MSc thesis was won 3rd place in the SBC (Brazilian Computing Society) Master Thesis Awards (link)
2020-07-15 📜 Two papers accepted at ICWSM 2021: "The Evolution of the Manosphere Across the Web" and "Sudden Attention Shifts on Wikipedia During the COVID-19 Crisis" (link) (link)
2020-04-09 📜 Paper out at Nature Communications: "Automatic diagnosis of the 12-lead ECG using a deep neural network", check photo for picture of 1/4th of authors (link) (photo)
2020-02-13 🎬 Gave a talk at Google Zurich (photo)
2020-01-28 🎬 Presented "Auditing Radicalization Pathways on YouTube" at FAT*2020 in Barcelona (link)
2019-12-17 🏆 "Auditing Radicalization Pathways on YouTube" was considered one of the top 100 most influential papers in 2019 (3rd in Computer Science) (link)
2019-11-20 📜 Paper accepted at FAT*2020: "Auditing Radicalization Pathways on YouTube" (link)
2019-08-31 🎒Moved to Switzerland to do my PhD @ EPFL! (photo)
2019-08-13 🎓 Defended my MSc Thesis: "Misinformation, Radicalization and Hate Through the Lens of Users" (photo)
2019-05-19 🎬 Presented "Message Distortion in Information Cascades" at the TheWebConf 2019, in San Francisco (link) (photo)
2019-01-21 📜 Paper accepted at TheWebConf 2019: "Message Distortion in Information Cascades" (link)
2018-10-24 🏆 Google will be sponsoring my MSc research through their Latin America Research Award (link) (photo)
2018-07-01 ☀️ This summer I'll work with Bob West at the Summer@EPFL program (link) (photo)
2018-07-22 🎬 Presented "Characterizing and Detecting Hateful Users on Twitter" in ICWSM 2018, at Stanford (link)
2018-03-22 📜 Paper accepted at ICWSM 2018: "Characterizing and Detecting Hateful Users on Twitter" (link)
2017-08-12 🎒 Attended the Cornell, Maryland, Max Planck Pre-doctoral Research School (photo)
2017-08-01 🎒 Joined UFMG MSc program
2017-07-26 🏆 Won Best Graduating Student Award for my BSc degree at UFMG
2017-07-19 🎓 Got a BSc in Computer Science from UFMG in a super formal ceremony (photo)