To add custom membership fields you have to
1. Create a custom data layer to persist your data for the custom fileds
2. Create a custom membership provider that extends our OpenAccessMembershipProvider with methods which will use to work with your custom fields
3. Create a custom class that inherits from Telerik.Sitefinity.Security.Model.User and implement several properties that you will use to get/set data to the custom fields you have added.
The user name of your user could be the email address. You just have to use an email for the username when a user is being registered.
We have Twitter and Facebook pipes that allows you to make posts there directly from the UI of Sitefinity - when you create a new blog post.
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