People participate in sites like mepeace are a self selected group who are able (and choose to) communicate in English, even if that is not their native language.
There must be many others out there who would we can encourage to participate but they unable to because they don't feel comfortable communicating in English.
We have been struggling with this issue HotPeace.org, because the mission of the site is precisely to get people talking who normally wouldn't participate in such efforts, so language may be an important concern for the success of the site.
What does everyone think? do you have friends who do not participate because of language barriers?