Editorial Work
- Area Editor, Network Science, a Cambridge University Press Journal
- Member of the Editorial Board, EPJ Data Science, a Springer Open journal
- Member of the Editorial Board, PeerJ Computer Science, an open access journal
- Member of the Editorial Board, Harvard Kennedy School Misinformation Review
Conference Organization and Program Committees
- NetSci 2017 (General Co-Chair)
- ICWSM 2017 Workshop on Digital Misinformation (Organizer)
- Web Science 2014 (General Co-Chair)
- COVEnANT 2013: Collective Behaviors and Networks (Organizing Committee)
- WWW 2012 (Co-Chair of Social Networks Track)
- Hypertext 2009 (20th ACM Conference on Hypertext and Hypermedia – Program Chair)
- WWW 2009 (18th International World Wide Web Conference – Social Networks and Web 2.0 track)
- WSDM 2009 (2nd ACM Intl. Conference on Web Search and Data Mining – Senior Program Committee)
- HT 2008 (19th Intl. ACM Conference on Hypertext and Hypermedia – Chair, Social Linking track)
- JASIST (Special Topic Issue on Mining Web Resources for Enhancing Information Retrieval)
- AAAI-07 (22nd National Conference on Artificial Intelligence – AI & Web track)
- AAAI-06 (21st National Conference on Artificial Intelligence – AI & Web track)
- SIGIR 2006 (29th Annual Intl. ACM SIGIR Conf. on R&D in Information Retrieval)
- ALIFE X (10th International Conference on the Simulation and Synthesis of Living Systems)
- WWW 2005 (14th International World Wide Web Conference)
- LinkKDD 2005 (KDD Workshop on Link Discovery and Group Detection)
- Informatics: Defining the Research Agenda
- WWW 2004 (13th International World Wide Web Conference)
- SIGIR 2002 (25th Annual International ACM SIGIR Conference – Poster Program)
- GECCO 2002 (Genetic and Evolutionary Computation Conference – AAAA track)
- INFORMS Annual Meeting 2001 (Chair, Web Mining session)
- Autonomous Agents 2001 (5th Intl. Conf. on Autonomous Agents)
- EMO’01 (1st Intl. Conf. on Evolutionary Multi-Criterion Optimization)
- ALIFE VII (7th International Conference on the Simulation and Synthesis of Living Systems)
- ALIFE VI (6th International Conference on the Simulation and Synthesis of Living Systems)
Other
- I serve on the board of the Network Science Society.
- I serve on the advisory board of the IU Network Science Institute (IUNI).
- In 2008-2012 I served on the School of Informatics and Computing’s website committee. Our website won two Webby Awards!
- I developed Recruit, which was once quite a useful system to support academic recruiting/hiring
- I am the former advisor of the IU Table Tennis Club. Among my service contributions, this was the one that made me sweat the most.
- I am the CNetS Espresso Club Czar. Among my service contributions, this is the one that keeps me up at night.