Isn't that why you can create groups where only certain people can see what you post to that group.
but there currently is no control on who sees what you like (pictures, groups etc..), comment on etc... Other than to block the person completely. and even then, not sure what the policy on that is about likes.
Either way, it's a confusing and annoying process that is IMO much easier solved by simply having two facebooks altogether. lol it's also peace of mind.. you don't have to "fix" (block certain groups, etc..) on everything you post or even worry about it showing up.