Remove (and optionally re-add) sharing links on WordPress.com

display-sharing-links.php

<?php sharing_display( '', true ); ?>

remove-sharing-links.php

function tilt_jptweak_remove_share() {
    remove_filter( 'post_flair', 'sharing_display', 20 );
    remove_filter( 'the_content', 'sharing_display', 19 );
    remove_filter( 'the_excerpt', 'sharing_display', 19 );

    if ( class_exists( 'Jetpack_Likes' ) ) {
        remove_filter( 'post_flair', array( Jetpack_Likes::init(), 'post_likes' ), 30, 1 );
        remove_filter( 'the_content', array( Jetpack_Likes::init(), 'post_likes' ), 30, 1 );
    }
}
add_action( 'loop_start', 'tilt_jptweak_remove_share' );