I recently discovered another method of restricting who can see what on Facebook.   You can set up sub-groups of FB friends, such as "Mudcat friends," "Family," "Business contacts," etc. Each your FB "friends" can be included in as many of those subgroups as you choose, or none.

When you "share" something on FaceBook, you can select whom you want to share it with: everyone, friends of friends, friends only, or "custom." If you select "custom," you can specify one person, a few people, or one (or more) sub-groups.   By choosing a sub-group, you avoid having to list each person separately. So, for example, if I want to share something with only my "radical communist leftist pinko friends," I can do that. Or if it's just for "family," I can also do that. Very convenient and useful for security.