Plugin development – wp_head no output

This is going to be my first plugin, plugin installs, but no output.

Am i missing something ?

<?php
add_action( 'wp_head', 'twitter_feed_farras_output' );

function twitter_feed_farras_output(){
?>
	<script type="text/javascript">
		    alert('output');
	</script>
<?php
}
?>