You should know that there is no such thing as blocking your Facebook info so that "only your friends can see it".  Such settings are a farce.  

Facebook is an information harvesting tool for all sorts of entities, including the Central Intelligence Agency, data marketing firms, advertisers, current and potential employers, and anyone else who wants to spy on you.  All of those cute little Facebook apps everyone loves, all the little "surveys", "tests", and everything else you do there, is sharing your life with a lot of people, none of whom you would choose to share it with if you realized what was going on.

Given the above, and the fact that there is a growing trend towards reviewing personal Facebook and Twitter accounts as part of the employment process, I suggest that you, and everyone else, delete all your social networking accounts.  They are hazardous to your peaceful enjoyment of life in the real world.

Facebook privacy is like a cake.  And the cake is a lie.