It can control who sees what you post. There is also a feature on all picture albums/statuses that decides who can see picture albums/statuses you post specifically. 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.