I'm preparing to give a master course at the annual conference for the World Future Society in July. I¹d like to select a social website for keeping the participants at the master course in touch. Wikipedia lists dozens of social network sites http://en.wikipedia.org/wiki/List_of_social_networking_websites Have you used one that you found particularly effective? I¹d like to give participants a way to keep working on the projects we discuss at the course. I have a colleague who has used Ning, describing it as being like Facebook, but with the capability of having it open only to the participants. What do you think? Adrienne Redd