gistfile1.php

add_action('init','crum_remove_post_share');
function crum_remove_post_share(){
	remove_action('reactor_post_footer', 'reactor_share_post', 6);
}

add_action('reactor_post_footer', 'crumina_custom_post_share', 6);
function crumina_custom_post_share(){
		
if ( is_single() ) {
		
		//enter your custom share code here
		
	}
}