Disable_twittercards_Jetpack.php

<?php 
// do not copy the line above

/**
 * Removes the twittercard-information from Jetpack
 * Thus allows WordPress SEO to handle the twittercards
 */ 
function yst_remove_twittercard_info() {
	remove_filter( 'jetpack_open_graph_tags', 'wpcom_twitter_cards_tags' );
	remove_filter( 'jetpack_open_graph_tags', 'change_twitter_site_param' );
}
add_action( 'template_redirect', 'yst_remove_twittercard_info' );