Social software needs an active user community before it becomes attractive to new visitors.
This paper analyzes and describes an attempt at attaining such critical mass for LogiLogi.org, an innovative philosophical discussion platform (described in this paper).
The paper examines the limited literature on critical mass, and reports on two usability studies that were done on LogiLogi. LogiLogi was then improved in ways that would maximize its chances of attaining critical mass (which did not succeed).
The literature review, as well as some of our conclusions may be useful to other web-applications.