very last action before during user registration before he is redirected to homepage

What hook is the social plugin using? If it’s also user_register, just delay your handler:

add_action( 'user_register', 'register_referral', 500 );

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)