Of course precautions must be made. I’m trying to think of how a person could be stalked by a friend of a friend on FB without actually Friending the stalker. Unless you mean they stalked them outside of FB. You just use common sense. Don’t put provocative pix of yourself, tell everyone that you will be on vacation for the next week, etc. Sure you may hear some stories of things that may happen to someone, but usually it’s someone who didn’t use caution when posting.
All of the things that you have listed are excellent safety precautions. It is very scary the number of evil people out there... not surprising given the state of the world but scary nonetheless. I guess when it comes to online social sites (beyond FR which is driven by ideology and patriotism) I practice abstinence. :-)
LLS