Search Results for author: Alessandro Flammini

Found 16 papers, 7 papers with code

Reconciling the Quality vs Popularity Dichotomy in Online Cultural Markets

no code implementations28 Apr 2022 Rossano Gaeta, Michele Garetto, Giancarlo Ruffo, Alessandro Flammini

We propose a simple model of an idealized online cultural market in which $N$ items, endowed with a hidden quality metric, are recommended to users by a ranking algorithm possibly biased by the current items' popularity.

Right and left, partisanship predicts (asymmetric) vulnerability to misinformation

no code implementations4 Oct 2020 Dimitar Nikolov, Alessandro Flammini, Filippo Menczer

We analyze the relationship between partisanship, echo chambers, and vulnerability to online misinformation by studying news sharing behavior on Twitter.

Misinformation Social and Information Networks Computers and Society

Detection of Novel Social Bots by Ensembles of Specialized Classifiers

no code implementations11 Jun 2020 Mohsen Sayyadiharikandeh, Onur Varol, Kai-Cheng Yang, Alessandro Flammini, Filippo Menczer

The ensemble of specialized classifiers (ESC) can better generalize, leading to an average improvement of 56\% in F1 score for unseen accounts across datasets.

Misinformation

Arming the public with artificial intelligence to counter social bots

no code implementations3 Jan 2019 Kai-Cheng Yang, Onur Varol, Clayton A. Davis, Emilio Ferrara, Alessandro Flammini, Filippo Menczer

Researchers have responded by developing AI tools to arm the public in the fight against social bots.

Computers and Society

Finding Streams in Knowledge Graphs to Support Fact Checking

1 code implementation24 Aug 2017 Prashant Shiralkar, Alessandro Flammini, Filippo Menczer, Giovanni Luca Ciampaglia

The volume and velocity of information that gets generated online limits current journalistic practices to fact-check claims at the same rate.

Fact Checking Knowledge Graphs +1

The spread of low-credibility content by social bots

2 code implementations24 Jul 2017 Chengcheng Shao, Giovanni Luca Ciampaglia, Onur Varol, Kaicheng Yang, Alessandro Flammini, Filippo Menczer

Communication, cognitive, social, and computer scientists are engaged in efforts to study the complex causes for the viral diffusion of misinformation online and to develop solutions, while search and social media platforms are beginning to deploy countermeasures.

Social and Information Networks Computers and Society Physics and Society

Online Human-Bot Interactions: Detection, Estimation, and Characterization

4 code implementations9 Mar 2017 Onur Varol, Emilio Ferrara, Clayton A. Davis, Filippo Menczer, Alessandro Flammini

Increasing evidence suggests that a growing amount of social media content is generated by autonomous entities known as social bots.

Social and Information Networks

Information Overload in Group Communication: From Conversation to Cacophony in the Twitch Chat

1 code implementation20 Oct 2016 Azadeh Nematzadeh, Giovanni Luca Ciampaglia, Yong-Yeol Ahn, Alessandro Flammini

Our analysis reveals the existence of a transition from a conversational state to a cacophony --- a state of overload with lower user participation, more copy-pasted messages, and less information per message.

Social and Information Networks Human-Computer Interaction Physics and Society

Predicting online extremism, content adopters, and interaction reciprocity

no code implementations2 May 2016 Emilio Ferrara, Wen-Qiang Wang, Onur Varol, Alessandro Flammini, Aram Galstyan

We present a machine learning framework that leverages a mixture of metadata, network, and temporal features to detect extremist users, and predict content adopters and interaction reciprocity in social media.

BotOrNot: A System to Evaluate Social Bots

2 code implementations2 Feb 2016 Clayton A. Davis, Onur Varol, Emilio Ferrara, Alessandro Flammini, Filippo Menczer

While most online social media accounts are controlled by humans, these platforms also host automated agents called social bots or sybil accounts.

Social and Information Networks

The DARPA Twitter Bot Challenge

no code implementations20 Jan 2016 V. S. Subrahmanian, Amos Azaria, Skylar Durst, Vadim Kagan, Aram Galstyan, Kristina Lerman, Linhong Zhu, Emilio Ferrara, Alessandro Flammini, Filippo Menczer, Andrew Stevens, Alexander Dekhtyar, Shuyang Gao, Tad Hogg, Farshad Kooti, Yan Liu, Onur Varol, Prashant Shiralkar, Vinod Vydiswaran, Qiaozhu Mei, Tim Hwang

A number of organizations ranging from terrorist groups such as ISIS to politicians and nation states reportedly conduct explicit campaigns to influence opinion on social media, posing a risk to democratic processes.

On predictability of rare events leveraging social media: a machine learning perspective

no code implementations20 Feb 2015 Lei Le, Emilio Ferrara, Alessandro Flammini

However, extents and contexts in which such forecasting power can be effectively leveraged are still unverified at least in a systematic way.

BIG-bench Machine Learning Sentiment Analysis

Clustering memes in social media streams

no code implementations3 Nov 2014 Mohsen JafariAsbagh, Emilio Ferrara, Onur Varol, Filippo Menczer, Alessandro Flammini

The problem of clustering content in social media has pervasive applications, including the identification of discussion topics, event detection, and content recommendation.

Clustering Event Detection

The Rise of Social Bots

1 code implementation19 Jul 2014 Emilio Ferrara, Onur Varol, Clayton Davis, Filippo Menczer, Alessandro Flammini

The Turing test aimed to recognize the behavior of a human from that of a computer algorithm.

Social and Information Networks Computers and Society Data Analysis, Statistics and Probability Physics and Society

Scale-free network growth by ranking

1 code implementation3 Feb 2006 Santo Fortunato, Alessandro Flammini, Filippo Menczer

Network growth is currently explained through mechanisms that rely on node prestige measures, such as degree or fitness.

Disordered Systems and Neural Networks Statistical Mechanics Physics and Society

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