This study evaluates an international collaborative project developed and practiced on the internet, as a form of SNS, focusing on how much university students from six countries worldwide participated in the project, from the viewpoint of the participants' contribution to the forum discussion of their own group's topic on education. The 66 participating students' communication data posted in the eight group forums were compiled and analyzed by quantitative and qualitative methods. As for the quantitative method, the corpus data comprising 48,990 running words was analyzed by topics and countries to obtain profiles of the characteristics of the participants' English language use in terms of message volume as well as vocabulary density, sentence length, and key words. As to the qualitative method, the data were analyzed by KBDeX software focusing on some key words such as "agree/disagree" and "opinion" to investigate the interactive discourse of discussion, negotiation, or mediation in each group. The results from both quantitative and qualitative analyses revealed the students of each country had their own distinguishing features in language use and communication patterns. [For full proceedings, see ED565087.]