A group that I’m a member of has a lot of local history supplied from the. . . locals. Someone thought it might be helpful to compile all this information offline somehow–other than by brute force of opening every thread and saving them one by one. It’s about two years’ worth of threads so that would be pretty time consuming!
You know about select all/copy/paste right? Should take only a few seconds per thread.
You could see if you could set up a script to do it automatically, but it depends on facebooks system whether that would be easy.