Remove Jetpack sharedaddy 'the_content' filter.

functions.php

<?php
//* do not include php tags

add_action( 'init', 'custom_init', 11 );
/**
 * Callback for WordPress 'init' action.
 * 
 * Remove the 'the_content' filter callback added by sharedaddy 
 * to prevent the sharing links from being appended to the posts content.
 * 
 * @see http://codex.wordpress.org/Plugin_API/Action_Reference/init
 * 
 * @since 0.2
 * @author Ryan Meier <rfmeier@gmail.com>
 * 
 * @return none
 */
function custom_init() {
  
    //* if sharing_display() function does not exist, return
    if( ! function_exists( 'sharing_display' ) ) {
        return;
    }
    
    //* remove the callback sharing_display() for the 'the_content' filter.
    remove_filter( 'the_content', 'sharing_display', 19 );
    
}