The advantage that the application tier:
-Search Contact easily by name, phone number, email OSs that you have obtained the contact information of people who are looking for
• Store all information in sufficient detail (eg, all id, links, social network accounts that you have)
-Why Up and restore your contacts (which can backup your entire photo list, and groups that you can recover on the device, different mobile platforms) on the internet passwords and account security
Your contacts will be divisible to others, and communities who use your contacts can add more complete contact record that you have (and you can not share OSs)
Let's build a community search easily mounted everyone!