aseba

<div id="tweet">
<?php
require_once(ABSPATH . 'wp-includes/class-snoopy.php');
$snoopy = new Snoopy;
$snoopy->fetch("http://twitter.com/statuses/user_timeline/[tu-nick].json?count=1");
$twitterdata = json_decode($snoopy->results,true);
?>
<h2><?php echo $twitterdata[0]["text"]; ?></h2>
</div>

Ojo con la parte de [tu-nick]

Via Yoast