I don't have it set to high security, but then thankfully I also have an extremely common name, like Jane Smith. So if anyone's wanting to find me specifically, they'll have to hunt through all the other same names as mine.
![So cool I can barely stand it! 8)](http://www.intensitysquared.com/Smileys/default/cool.gif)
I'm not particularly active either. I use it more to keep up with a small handful of friends. And I only have people on my friends list who I know (either good online friends or people irl).
Main thing is never post on FB something you wouldn't want your employer (current or future) to know about you.