I want to start a new topic, and label it "the diary of lost-fanatics"
I want it to be so that everyone can feel free to write their own diary there, or just comment on somebody else's...
Has this been done before??
If not, does it fit better in "not Lost" or "Lost who" or...??

Thanks in advance :)

I am not sure it is really appropriate for this site. I mean each thread should have a topic and stay on that topic or we get back to the problem of the huge chit chat threads. Have you tried Live Journal or something similar?