Beth, I visit the Bipolar forum to provide support, as it's not one of my acronyms (bad joke), but I feel like, in a way all threads are really personal threads and if you want to continue to update one thread then why not?
I have threads dating back to when I joined 6years ago. And it's very helpful for me to look back and see what I wrote about what was happening, especially at times when I was less stable, and I'm trying to remember what happened.
I'm not sure what anyone else's issue is with is. I support people starting threads for their ongoing support if that helps them. I also support them creating specific threads about specific problems, if that helps them as well. I support people getting support however they need it.
You do you.