Mysql – How to update primary key table based on foreign key with ON DUPLICATE KEY UPDATE

I have a users table with autoincrement id as primary key, and unique key on email. The email and name fields are from facebook.

+----+-------+------+
| id | email | name |
+----+-------+------+

And a facebook users table,

+--------+----------+
| userId | fbUserId |
+--------+----------+

The userId in the facebook table will be a foreign key value, referencing id in the users table. The fbUserId is guaranteed to be unique by facebook. The reason I split these tables up is I plan to have more social logins in the future, and I'm trying make my schema future proof. Each additional table would also have a userId, linking it back to users.

Right now my insert update query is this

BEGIN;
    INSERT IGNORE INTO users 
    (id,email,name) 
    VALUES (0,?,?);

    INSERT IGNORE INTO users_facebook
    (userId, fbUserId)
    VALUES (LAST_INSERT_ID(), ?);
COMMIT

From what i understand, ON DUPLICATE KEY UPDATE only applies to a single row in a single table. What i'd like to do is if email or name is different for an existing fbUserId, i'd like to update the changed fields. How would i do this?

Also, any thoughts on my current query? I'm quite new to mysql.