title: How to handle the address book in my application in an effective way
body: <p>I am creating an app which using address book.I am sending all my contacts to server each time to get the list of contacts who all are using the app and I should get the notification for new users in my contacts.I don’t think it is an effective way(sending all contacts everytime).Can any one suggest me how to handle the scenarios like edit contact,delete contact.How to avoid the sending of all contacts to server each time when I am opening the app.Also suggest me an effective algorithm to make best app</p>