Privacy and confidentiality

When people create their accounts on social networking sites, they put a lot of personal information without careful thinking.  We voluntary put our personal information such as genders, our full names, birthdates, addresses, name of schools, phone numbers, political views, religious affiliations, personal statements, lists of hobbies, social groups, lists of favorite things, employment histories, email addresses, family members and the places where we check in on Facebook.  When people post their pictures on Facebook, they tag their friends and place where they been to.  Then, all the Facebook friends and also the friends of friends who were tagged in the pictures will also know when and where they were.  Thus, whatever, whenever, wherever, people post something on their Facebook, it will be seen by many people which may mean hundreds of thousands you never know who is really looking at our information.  Moreover, a lot of people have many mutual friends on their Facebook; thus, their personal life, such as their friends, family, boyfriends or girlfriends and husbands or wives might be gossiping in real life.  For example, when people break up with their boyfriends or girlfriends, their relationship status that they put on their Facebook will be seen by many of their friends and it will also be gossiping in real life so that sometimes even though some people who don't even really know you, will also know your personal life.    Thus,  we are giving too much private information to the social network.