-\item 2012-07-17. Status, Social Signalling and Collective Action in a
- Peer Production Community. Regular Session on Group
- Processes. American Sociological Association Annual Meeting, Denver,
- Colorado.
-\item 2012-08-13. Almost Wikipedia: What eight early online
- collaborative encyclopedia projects reveal about the mechanisms of
- collective action. Microsoft Research, Cambridge, Massachusetts.
-\item 2012-07-14. Almost Wikipedia: What eight early online
- collaborative encyclopedia projects reveal about the mechanisms of
- collective action. Wikimania 2012, George Washington University,
- Washington, DC.
-\item 2012-07-12. Can can social awards create better wikis? Wikimania
- 2012, George Washington University, Washington, DC.
-\item 2012-06-29. When peer production works: Learning from failures, to
- improve collaboration. Wikipedia Academy. Freie Universität Berlin ,
- Germany. (\emph{Keynote address})
-\item 2012-04-24. Is volunteer labor a ``fixed and finite'' resource?
- Evidence from peer production. MIT Economic Sociology Working Group.
-\item 2011-11-02. Almost Wikipedia: What eight early online
- collaborative encyclopedia projects reveal about the mechanisms of
- collective action. Wikimedia Foundation, San Francisco, California.
-\item 2011-10-29. Almost Wikipedia: What eight early online
- collaborative encyclopedia projects reveal about the mechanisms of
- collective action. Conference on Digital Commons, Barcelona, Spain.
-\item 2011-10-28. Status, Social Signalling and Collective Action in a
- Peer Production Community. With Aaron Shaw. Laboratory for Social
- Research Seminar, University of California Berkeley.
-\item 2011-10-11. Almost Wikipedia: What eight early online collaborative
- encyclopedia projects reveal about the mechanisms of collective
- action. Luncheon Series, Berkman Center for Internet and Society,
- Harvard University.
-\item 2011-07-01. Using Social Awards To Build Better Free Software \&
- Free Culture Projects. With Aaron Shaw. Fórum Internacional
- Software Livre, Porto Alegre, Brasil.
-\item 2010-11-17. Almost Wikipedia: What eight early online
- collaborative encyclopedia projects reveal about the mechanisms of
- collecdtive action. MIT Economic Sociology Working Group. % hidden
-\item 2010-08-02. ``What the community is remixing:'' The effect of a
- new status-based incentive to collaborate in an online collaborative
- community. MIT Open and User Innovation Workshop.
-\item 2010-06-10. Reviewing and challenging socio-political
- approaches in the analysis of open collaboration and collective
- action online. With Mayo Fuster Morell. WikiSym 2010. Gdansk,
- Poland.
-\item 2010-06-09. ``What the community is remixing:'' The effect of a
- new status-based incentive to collaborate in an online collaborative
- community. MIT Economic Sociology Working Group. % hidden
-\item 2010-04-26. Two empirical analyses of cooperation in
- Scratch. With Andrés Monroy Hernández. Harvard Cooperation Group,
- Berkman Center for Internet and Society.
-\item 2009-11-20. The State of FLOSS Research. University of
- Massachusetts Department of Computer Science in Amherst,
- Massachusetts.
-\item 2008-10-21. Revealing Errors. Harvard-MIT-Yale Cyberscholar
- Working Group. Harvard University.
-\item 2008-04-07. Renaissance Panel: The Roles of Creative Synthesis
- in Innovation. CHI 2008 in Florence, Italy.
-\item 2007-11-15. Reflections on Decoding Liberation. Book Launch
- Event for \emph{Decoding Liberation} at Brooklyn College. % hidden
-\item 2008-01-22. Clouding Computing and Free and Open Source
- Software. Computing in the Cloud Workshop at the Center for
- Information Technology Policy at Princeton University.
-\item 2007-04-27. Reflections on the War on Share. With Elizabeth
- Stark. Media in Transition 5 Conference at MIT.
-\item 2007-06-27. Parallel Document Development. User Innovation
- Conference at Copenhagen Business School.
-\item 2006-06-02. Defining Moments, Conference on Engaging in Open
- Source (CEOS) organized by the ACM Chapter at Dalhousie University
- in Halifax, Nova Scotia. % hidden