There is no "private" information which a potential employer is able to "see". If a potential employer or some other stranger is able to see information on a Facebook, the information viewed is public, not "private".  

The owners of Facebook pages choose whether their information is public or private. This is true in the "Information" about us (such as employment, education, marital status, birthday, etc , our  "photos",  our "friends" , phone number, email address, our "likes", etc. and we choose, point by point, who can see it: whether only the person whose FB page it is, friends, friends or friends or the public. Similarly, every single time we post a status update, a link, a photo, we have the opportunity to indicate who can see it, again, only the person whose page it is, friends, friends of friends, public or we can customize it to specific lists or we can only let specific person(s) see it and we can exclude its visibility to specific person(s). 

