WP: Add extra contact methods from user info

gistfile1.txt

function add_contact_methods( $contactmethods ) {
    // Add Google Profiles
    $contactmethods['google_profile'] = 'Google Profile URL';

    return $contactmethods;
}
add_filter( 'user_contactmethods', 'add_contact_methods', 10, 1);


Author.php
==========
$google_profile = get_the_author_meta( 'google_profile' );
if ( $google_profile ) {
	echo '<a href="' . esc_url($google_profile) . '" rel="me">Google Profile</a>';
}