content-author-tweet.php

<?php
function prefix_show_latest_tweet() {

	if ( ! class_exists( 'TwitterWP' ) )
	    require_once( 'path_to/TwitterWP.php' );

	// get data for current post author
	$curauth = get_userdata( $post->post_author ); 

	$twitter_id = $curauth->twitter;
	$app = array(
		'consumer_key'        => 'nbRYD9VZGOk8VDiqvuVg',
		'consumer_secret'     => 'MMtHXv9ErHjLEOcNJLjNWfC3WRVy1Qe3qHE4vl4Uo',
		'access_token'        => '1330201-jMrtoilTOGUCneecIV5yGYD6mUh8tmxbf5OWEUM',
		'access_token_secret' => 'wzW875Vsj2xlGQivqvW1h35Zq7GkT6VqLVtBn0gJqY',
	);
	// initiate your app
	$tw = TwitterWP::start( $app );

	// bail here if the user doesn't exist
	if ( ! $tw->user_exists( $twitter_id ) )
		return;

	$tweets = $tw->get_tweets( $twitter_id, 1 );
	if ( is_wp_error( $tweets ) )
		return;

	foreach( $tweets as $chirp ) {
		echo apply_filters( 'the_content', 'https://twitter.com/'. $twitter_id .'/status/'. $chirp->id_str );
	}
	
}