Publications de Alexandra Olteanu

Probing the Limits of Social Data : Biases, Methods, and Domain Knowledge

Online social data has been hailed to provide unprecedented insights into human phenomena due to its ability to capture human behavior at a scale and level of detail, both in breadth and depth, that is hard to achieve through conventional data collection t ...

EPFL2016

Comparing Events Coverage in Online News and Social Media: The Case of Climate Change

Karl Aberer, Alexandra Olteanu, Carlos Castillo

Social media is becoming more and more integrated in the distribution and consumption of news. How is news in social media different from mainstream news? % This paper presents a comparative analysis covering a span of 17 months and hundreds of news events ...

2015

What to Expect When the Unexpected Happens: Social Media Communications Across Crises

Alexandra Olteanu, Carlos Castillo

2015

Comparing the Predictive Capability of Social and Interest Affinity for Recommendations

Karl Aberer, Anne-Marie Kermarrec, Alexandra Olteanu

The advent of online social networks created new prediction opportunities for recommender systems: instead of relying on past rating history through the use of collaborative filtering (CF), they can leverage the social relations among users as a predictor ...

Springer-Verlag Berlin2014

CrisisLex: A Lexicon for Collecting and Filtering Microblogged Communications in Crises

Alexandra Olteanu, Carlos Castillo

2014

Web Credibility: Features Exploration and Credibility Prediction

Karl Aberer, Alexandra Olteanu, Stanislav Peshterliev, Xin Liu

2013

CredibleWeb: A Platform for Web Credibility Evaluation

Karl Aberer, Alexandra Olteanu, Zhicong Huang

2013

A Decentralized Recommender System for Effective Web Credibility Assessment

Karl Aberer, Alexandra Olteanu, Jean-Eudes Marie Ranvier

An overwhelming and growing amount of data is available online. The problem of untrustworthy online information is augmented by its high economic potential and its dynamic nature, e.g. transient domain names, dynamic content, etc. In this paper, we address ...

2012

Topick: Accurate Topic Distillation from Users Streams

Karl Aberer, Anton Rosenov Dimitrov, Alexandra Olteanu, Lucas Kelsey McDowell

2012

Towards Robust and Scalable Peer-to-Peer Social Networks

Alexandra Olteanu

2012