How to store facebook user data into database ?

[eluser]Keloo[/eluser]
Hi I'm working on an ecommerce site and I want my users to login with their facebook accounts, but I want to grab that data and store it into the db using codeigniter.

How should I do it ?

Can anyone help me with a few tips, or links?

I've managed to authenticate using facebook API, but I need somehow to store that user related data into a users table.