Facebook – View Profile from Friends of Friends Perspective

This is a complete guess here, but I would think that in the first scenario, Bob would not be able to see the item, but if Bob was friends with John, then he would be able to. There has to be a connection in the social graph between the item and the viewer.

The security/privacy filter should determine of list of people who have direct access to the item, which would only be your friends, then, since it was a F-of-F item, it would look to see if the person viewing has a direct connection to one of those people.

Again, that's just a guess, but I would think if it worked any other way it would be a bug.

You cannot hide your Facebook completely from search results, you can limit who can find you by your phone number or email address.

Why?

Your name, gender, username, and user ID (account number), along with your profile picture, cover photo, and networks (if you choose to add these) are available to anyone. This is because this information is essential to helping you connect with your friends and family.

To limits who can see your friends go to http://www.facebook.com/<yourusername>/friends click Edit and change to "Only Me", but there are still issues see more at How to hide Mutual Friends from others on Facebook ?