Maybe, but your interactions are still inferable. If you have friends their interactions with you are also inferable. Anyone or any group you associate with in Fb has the same problem. In some ways what Fb can infer is just as much a problem. So the question remains, "how useful is inference of data to Fb really going to be?"
This was the problem of Livejournal, altho' you could set your journal to be friends-only, your profile page was not. So who you were friends with, what your interests were, what communities you were a member of were completely public. Your only privacy option was hoping that no-one you didn't want to knew your username. Interests you could skip, obv, but because of the way the security model works, the world knew who had permission to read your journal and whose journals you read. So you were only ever as secure as the least-discreet person you knew. And I have some very indiscreet friends...
Maybe, but your interactions are still inferable. If you have friends their interactions with you are also inferable. Anyone or any group you associate with in Fb has the same problem. In some ways what Fb can infer is just as much a problem. So the question remains, "how useful is inference of data to Fb really going to be?"