It really depends on whether you have an "open" friending policy or not, and if you have family/work friends/etc. who deter real sharing. And then whether you

It really depends on whether you have an "open" friending policy or not, and if you have family/work friends/etc. who deter real sharing. And then whether you share to public, friends of friends, friends, or subgroups. Doing all this per-post is probably more work than I'd be willing to deal with, so I just set it as "friends", and add people who are interesting on my friends own posts to my fl. LiveJournal (RIP) is what trained me in all this behavior.