Si

I don't think it's anything to really panic about if you have all your entries f-locked (which you do, I think?) and don't have anyone on your FaceBook friends list who's also on your LJ flist. People who aren't on your flist still won't be able to read your locked entries. Really it's just something that it's useful to be aware of. As long as you're careful, I don't think it's something you should worry about.
I'm a little less careful than I possibly should be, so I just find the whole thing a little disconcerting, to say the least :/