In reality, I would have far more options; there's a long gradient of subtle ways to let him know to what extent he's my friend or not. Most of all, I would have the option to defer making any kind of statement, assuming he's not a nutcase who asked me "so are we really friends?" And that deferral -- plausible deniability -- is the first thing FB takes away. That's what I call the freedom to be left alone.