Is there any chance to check logged in facebook users? As far as I can see, all photos uploaded to facebook are public. Even if you restrict your page/posts usi

Is there any chance to check logged in facebook users? As far as I can see, all photos uploaded to facebook are public. Even if you restrict your page/posts using age or country - everyone can see the shared picture if he loads the url directly. So facebook is "save" for this exploit, but should restricted photos be public available?