Editorial boards


Internet Mathematics, managing editor, 2015 -- present
Data Mining and Knowledge Discovery, DMKD, editorial board, 2015 -- present
ACM Transactions on Knowledge Discovery from Data, TKDD, associate editor, 2014 -- present
IEEE Transactions on Knowledge and Data Engineering, TKDE, associate editor, 2012 -- 2016

Program committee co-chair


International World Wide Web Conference WWW 2016, co-chairing the social networks and graph analysis track (with Haewoon Kwak and Alessandra Sala)
International World Wide Web Conference WWW 2014, co-chairing the social networks and graph analysis track (with Alessandro Panconesi)
ACM International Conference on Web Search and Data Mining WSDM 2013 (with Paolo Ferragina)
European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases ECML PKDD 2010 (with José Luis Balcázar,
Francesco Bonchi, and Michele Sebag)

Senior program committee or area chair


ACM SIGKDD Conference on Knowledge Discovery and Data Mining, KDD 2015, 2014, 2013, 2011, and 2006
ACM Special Interest Group on Information Retrieval Conference, SIGIR 2014 and 2013
European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, ECML PKDD 2014, 2013, 2011, and 2008
ACM International Conference on Information and Knowledge Management, CIKM 2014
IEEE International Conference on Data Mining, ICDM 2014
IEEE International Conference of Database Engineering, ICDE 2012, area chair on "social networks, web, and personal information management" track

Program committee member


Program committee member of the major conferences in data mining, databases, web sciences, and information retrieval: KDD, VLDB, SIGMOD, WWW, WSDM, SIGIR, ICML, ICALP, ICDM, ECML PKDD, EDBT, ICDE, CIKM, RecSys, ...

Other committees


SIGIR 2016 workshop chair
WSDM 2016 treasurer
ACM SIGKDD 2015 doctoral dissertation award committee
Co-chair of KDD 2013 best paper award committee (with Charles Elkan)
ICDM 2013 doctoral forum chair
ECIR 2012 registration chair
WSDM 2009 registration chair

Workshop organization


First workshop on social news on the web, SNOW 2013, in conjunction with the World Wide Web 2013 conference