database re-organization

What we want: Edit Social_media module for store the user information as twitter module do in our website. Twitter module store user information using the following tables, we would like that social_media store the information in the same way: >>>see attached file for tables The aim is have a homogeneous information in the database of each user, doesn't matter which way of registration they choose. Registration steps are: • User register in the system with their Facebook account saving the information as I said above. • If the email exists in the system, the system send an message saying that user already exists. (user have logged with twitter account using same email)