It's not quite the same, but a circle of college friends have a long-running email thread which we use for this purpose. Everyone usually sends a "What I did on the weekend" email update on monday morning, then random tidbits/links/experiences over the week.

It's a great, casual way to stay in touch with a lot of friends. A few I keep in touch daily through GChat, but the others I depend on the email chain. I look forward to Monday morning to read what everyone did over the weekend.