| 2024 | Co-Organizer of 7th Workshop on Human Factors in Hypertext (HUMAN'24) |
| 2023 | Co-Organizer of 6th Workshop on Human Factors in Hypertext (HUMAN'23) |
| 2022 | Track Chair on Digital Humanities, culture, and society of ACM Conference on Hypertext and Social Media (HT'22) |
| 2022 | Co-Organizer of 5th Workshop on Human Factors in Hypertext (HUMAN'22) |
| 2022 | Program Co-Chair IEEE Conference on Semantic Computing |
| 2021 | Co-Organizer of 4th Workshop on Human Factors in Hypertext (HUMAN'21) |
| 2021 | Program Co-Chair IEEE Conference on Semantic Computing |
| 2020 | Co-Organizer of 3rd Workshop on Human Factors in Hypertext (HUMAN'20) |
| 2019 | Co-Organizer of 2nd Workshop on Human Factors in Hypertext (HUMAN'19) |
| 2019 | General Co-Chair ACM Hypertext and Social Media |
| 2003-2018 | PC Member of IADIS WWW/Internet |
| 2018 | Co-Organizer of 1st Workshop on Human Factors in Hypertext (HUMAN'18) |
| 2017 | Workshop Co-Chair ACM Hypertext and Social Media |
| 2016 | Program Co-Chair ACM Hypertext and Social Media |
| 2015 | PC Member ACM Hypertext and Social Media |
| 2012- | Member of ACM SIGWEB Executive Committee |
| 2011-2019 | ACM SIGWEB Newsletter Editor |
| 2007-2011 | SIGWEB Newsletter Editor: PhD Column |
| 2010 | Co-Organizer Web/Art/Science Camp, 1st ACM SIGWEB Unconference |
| 2010 | Reviewer Journal "New Review of Hypermedia and Multimedia" (Taylor & Francis), Special Issue on "Hypertext and Web Science" |
| 2008 | PC Member Workshop on Web Science: Collaboration and Collective Intelligence at ACM Hypertext and Hypermedia |
| 2007 | PC Member ACM Hypertext and Hypermedia |
| 2006 | Program Co-Chair ACM Hypertext and Social Media |
| 2005 | PC Member of Workshop on Computational Hypermedia |
| 2005 | PC Member and Track Chair for Collaborative Hypermedia at ACM Hypertext and Hypermedia |
| 2004 | Posters and Demonstrations Chair ACM Hypertext and Hypermedia |
| 2002-2004 | PC Member of Metainformatics |
| 2003 | PC Member of WWW (Hypermedia Track) |
| 2002 | Program Committee (PC) Member of CRIWG (Groupware Workshop) |
