1. Don't use Facebook :)
2. If you use it don't tag your family members as such. Or your close friends as FB "close friends"
3. Never tag anyone in photos
4. Never set "relationship status"
5. Never add info about where do you live, work, etc.
6. Having separate public profile for your company/work related stuff is probably a good idea.
7. Never post anything you wouldn't want to see in CNN news :)