210 citations · 563 across the 27 of their papers we have counts for
28 papers
SoK: Formal Methods for Fact-Checking and Information Integrity
Nikolaos Kekatos, Theodoros Nestoridis, Charalampos Bratsas +5
An automated fact-checking system returns a label: the claim is true, or it is false. In many such systems the verdict remains the primary output. What is generally missing is a re…
Two Fault Lines: Latent Polarity Geometry in X Community Notes
Andreas Andreou, Michael Sirivianos
Community Notes is X's crowdsourced fact-checking system. A note is published beneath the post it corrects only when raters who usually disagree both rate it helpful, a design call…
DeTox-Fed: Detecting Toxic Conversations in the Fediverse with Federated Graph Neural Networks
Pantelitsa Leonidou, Nikos Salamanos, Sotiris Gypsiotis +1
The rise of decentralized social networks (DSNs), and in particular the rapid uptake of the Fediverse (e.g., Pleroma, Mastodon, Lemmygrad), introduces new challenges in content mod…
Exploring Left-Wing Extremism on the Decentralized Web: An Analysis of Lemmygrad.ml
Utkucan Balci, Michael Sirivianos, Jeremy Blackburn
This study investigates the presence of left-wing extremism on the Lemmygrad.ml instance of the decentralized social media platform Lemmy, from its launch in 2019 up to a month aft…
HyperGraphDis: Leveraging Hypergraphs for Contextual and Social-Based Disinformation Detection
Nikos Salamanos, Pantelitsa Leonidou, Nikolaos Laoutaris +3
In light of the growing impact of disinformation on social, economic, and political landscapes, accurate and efficient identification methods are increasingly critical. This paper…
Identifying Misinformation on YouTube through Transcript Contextual Analysis with Transformer Models
Christos Christodoulou, Nikos Salamanos, Pantelitsa Leonidou +2
Misinformation on YouTube is a significant concern, necessitating robust detection strategies. In this paper, we introduce a novel methodology for video classification, focusing on…
Roll in the Tanks! Measuring Left-wing Extremism on Reddit at Scale
Utkucan Balcı, Michael Sirivianos, Jeremy Blackburn
Social media's role in the spread and evolution of extremism is a focus of intense study. Online extremists have been involved in the dissemination of online hate, mis- and disinfo…
Privacy-Preserving Online Content Moderation: A Federated Learning Use Case
Pantelitsa Leonidou, Nicolas Kourtellis, Nikos Salamanos +1
Users are daily exposed to a large volume of harmful content on various social network platforms. One solution is developing online moderation tools using Machine Learning techniqu…
A Unified Graph-Based Approach to Disinformation Detection using Contextual and Semantic Relations
Marius Paraschiv, Nikos Salamanos, Costas Iordanou +2
As recent events have demonstrated, disinformation spread through social networks can have dire political, economic and social consequences. Detecting disinformation must inevitabl…
A First Look into the Structural Properties and Resilience of Blockchain Overlays
Aristodemos Paphitis, Nicolas Kourtellis, Michael Sirivianos
Blockchain (BC) systems are highly distributed peer-to-peer networks that offer an alternative to centralized services and promise robustness to coordinated attacks. However, the r…
"It is just a flu": Assessing the Effect of Watch History on YouTube's Pseudoscientific Video Recommendations
Kostantinos Papadamou, Savvas Zannettou, Jeremy Blackburn +3
The role played by YouTube's recommendation algorithm in unwittingly promoting misinformation and conspiracy theories is not entirely understood. Yet, this can have dire real-world…
A Privacy-Preserving Architecture for the Protection of Adolescents in Online Social Networks
Markos Charalambous, Petros Papagiannis, Antonis Papasavva +8
Online social networks (OSN) constitute an integral part of people's every day social activity. Specifically, mainstream OSNs such as Twitter, YouTube, and Facebook are especially…
Did State-sponsored Trolls Shape the 2016 US Presidential Election Discourse? Quantifying Influence on Twitter
Nikos Salamanos, Michael J. Jensen, Costas Iordanou +1
It is a widely accepted fact that state-sponsored Twitter accounts operated during the 2016 US presidential election, spreading millions of tweets with misinformation and inflammat…
Hihooi: A Database Replication Middleware for Scaling Transactional Databases Consistently
Michael A. Georgiou, Aristodemos Paphitis, Michael Sirivianos +1
With the advent of the Internet and Internet-connected devices, modern business applications can experience rapid increases as well as variability in transactional workloads. Datab…
"How over is it?" Understanding the Incel Community on YouTube
Kostantinos Papadamou, Savvas Zannettou, Jeremy Blackburn +3
YouTube is by far the largest host of user-generated video content worldwide. Alas, the platform has also come under fire for hosting inappropriate, toxic, and hateful content. One…
On the Influence of Twitter Trolls during the 2016 US Presidential Election
Nikos Salamanos, Michael J. Jensen, Xinlei He +2
It is a widely accepted fact that state-sponsored Twitter accounts operated during the 2016 US presidential election spreading millions of tweets with misinformation and inflammato…
Disturbed YouTube for Kids: Characterizing and Detecting Inappropriate Videos Targeting Young Children
Kostantinos Papadamou, Antonis Papasavva, Savvas Zannettou +5
A large number of the most-subscribed YouTube channels target children of a very young age. Hundreds of toddler-oriented channels on YouTube feature inoffensive, well-produced, and…
Killing the Password and Preserving Privacy with Device-Centric and Attribute-based Authentication
Kostantinos Papadamou, Savvas Zannettou, Bogdan Chifor +9
Current authentication methods on the Web have serious weaknesses. First, services heavily rely on the traditional password paradigm, which diminishes the end-users' security and u…
Who Let The Trolls Out? Towards Understanding State-Sponsored Trolls
Savvas Zannettou, Tristan Caulfield, William Setzer +3
Recent evidence has emerged linking coordinated campaigns by state-sponsored actors to manipulate public opinion on the Web. Campaigns revolving around major political events are e…
On the Origins of Memes by Means of Fringe Web Communities
Savvas Zannettou, Tristan Caulfield, Jeremy Blackburn +4
Internet memes are increasingly used to sway and manipulate public opinion. This prompts the need to study their propagation, evolution, and influence across the Web. In this paper…
The Web of False Information: Rumors, Fake News, Hoaxes, Clickbait, and Various Other Shenanigans
Savvas Zannettou, Michael Sirivianos, Jeremy Blackburn +1
A new era of Information Warfare has arrived. Various actors, including state-sponsored ones, are weaponizing information on Online Social Networks to run false information campaig…
What is Gab? A Bastion of Free Speech or an Alt-Right Echo Chamber?
Savvas Zannettou, Barry Bradlyn, Emiliano De Cristofaro +4
Over the past few years, a number of new "fringe" communities, like 4chan or certain subreddits, have gained traction on the Web at a rapid pace. However, more often than not, litt…
Large Scale Crowdsourcing and Characterization of Twitter Abusive Behavior
Antigoni-Maria Founta, Constantinos Djouvas, Despoina Chatzakou +6
In recent years, offensive, abusive and hateful language, sexism, racism and other types of aggressive and cyberbullying behavior have been manifesting with increased frequency, an…
Understanding Web Archiving Services and Their (Mis)Use on Social Media
Savvas Zannettou, Jeremy Blackburn, Emiliano De Cristofaro +2
Web archiving services play an increasingly important role in today's information ecosystem, by ensuring the continuing availability of information, or by deliberately caching cont…