GriefNet is an Internet community approach to on line grief support, providing support to people working through loss and grief issues of all kinds. Cendra Lynn is the leader of the organization, and I had some small technological part in starting it back in 1993 when the appropriate technology of the day was Gopher, not the World Wide Web. The system hosts dozens of moderated mailing lists for people who share a common loss like the death of a spouse or the loss of a child.
I had a nice conversation with Cendra last night about how hard it is to build a community where people who are going through a lot can have a place where they can trust each other enough to share what are not easy feelings to share. It takes active moderation, careful planning, and a constant attention to the details of online identity. The technology is not fancy - they are using the Mailman mailer, which is now 15 years in development - and the key community insight is that it's utterly crucial to keep people's identity pseudonomous (first name only) so that people can focus on working through grief and not get distracted by the rest of people's real lives. This is so completely unlike the over-sharing Google Plus and overtly commercialized Facebook as to be worthy of note.