[icecold]

I know of one quest that changes its title every so often when the main character changes. It happened recently to one thread I follow that added Peggy Sue to the title. I want to say that it happens at least once every three months, though I haven't exactly been keeping track of how often it happens. One author I follow just went off hiatus and changed his two stories' titles to reflect that this week.

Edit: I haven't exactly noticed any particular one forum (SB/SV/QQ) doing thread renaming more often than the other forums.