6degrees, a Singapore-based phonebook app, is named after the theory and aims to make connections simple. However, it is also very easy to lose contacts of all the relations because our phone contacts are currently offline. The only way to update contact information like email address, phone number, house address is to send mass messages, even if you are already connected on other social networking services, like Facebook, Twitter. Normally, when users search people on their phones, it will only show contacts stored in the phonebook, that’s your first degree of contact. 6degrees will show the contacts of your friends’ friends to expand the social circle.