Mixing Facebook members (thru FB-connect) and Non-facebook members on Social site

[eluser]FutureKing[/eluser]
I have to develop an application in which user can register by filling registration form or by using facebook connect.

This is first time I am developing such type of application. Previously I developed normal registration form based application.

For normal application I design "users" table in this way:

id
username
password
email
status
act_code
registered_on
activated_on
last_login

Now I have to integrate Facebook connect accounts too with this table. What modifications should I make, so that this table can handle both facebook accounts and its own accounts.