Selected Publications

Political Discourse on Social Media: Echo Chambers, Gatekeepers, and the Price of Bipartisanship. WWW 2018. [ACM][arXivWith K. Garimella, G. De Francisci Morales, A. Gionis. Covered on CNETLe Monde.

Tutorial: Polarization on Social Media. [slidesWWW 2018 and AAAI ICWSM 2017. With K. Garimella, G. De Francisci Morales, A. Gionis

Markov Chain MonitoringSDM 2018With Harshal Chauduri, Evimaria Terzi. [arXiv – full version]

Quantifying Controversy on Social Media. Springer Transactions on Social Computing 2017. With K. Garimella, G. De Francisci Morales, A. Gionis

The Effect of Collective Attention on Controversial Debates on Social Media. WebSci 2017. With K. Garimella, G. De Francisci Morales, A. Gionis. Best Student Paper. [Slides]

Reducing Controversy by Connecting Opposing Views. WSDM 2017. With K. Garimella, G. De Francisci Morales, A. Gionis. [ACM][SlidesBest Student Paper. Covered on Acolyer, Aalto News, Communications of ACM – News, Science Newsline, Slate.

Local Discrepancy Maximization on Graphs. TKDE 2017. [IEEEXploreWith A. Gionis, A. Ukkonen

Modeling Urban Behavior by Mining Urban Data. IEEE Transactions on Big Data / Special Issue on Urban Computing. With E. Çelikten, G. Le Falher. [IEEEXplore]

“What Is the City but the People?” Exploring Urban Activity Using Social Web Traces. Demo at WWW2016. With E. Çelikten, G. Le Falher.  [ACM] [pdf]

Absorbing random-walk centrality: Theory and algorithms. ICDM 2015. With A. Gionis, H. Mavroforakis. [Arxiv] [Slides] [Blog Post]

Sparsification of influence networks. Appeared at KDD 2011. With Francesco Bonchi, Carlos Castillo, Aristides Gionis, and Antti Ukkonen. [ACM][Code]

Other Publications available on Google Scholar and DBLP.

Professional Service
Current or recent reviewer for PVLDB 2019, ICDE 2019, and IEEE TKDE.

Examination committee member for 6 PhD defenses.

Longer list maintained here.


Network Analysis, University of Helsinki, Spring 2019, with Ben Hui.
News and Media on the Web, Seminar, University of Helsinki, Fall 2019.
Introduction to Big Data Management: Semi-structured data and MongoDB, University of Helsinki, Fall 2019, with Jiaheng Lu.
Data Science Project, University of Helsinki, Fall 2019.

Data Science, INSA Lyon, Fall 2017.
Modern Database Systems, Aalto, Spring 2017, with Aristides Gionis.
Modern Database Systems, Aalto, Spring 2016, with Aristides Gionis.
The course covers (i) relational database systems and disk access analysis, (ii) querying and indexing for semi-structured data and text, (iii) Map-Reduce and Apache Spark.
Mining the Social Web, Aalto, Spring 2015, with Aristides Gionis.