I develop my website on a testing server where "WP_DEBUG" is TRUE.
There I can see many PHP Notices all over the final page because of Mini Twitter Feed.
2 reasons to that, first I had to replace
$options .= (($atts['limit'])?'limit:'.$atts['limit'].',':'');
$options .= (($atts['query'])?'query:"'.$atts['query'].'",':'');
$options .= (($atts['list'])?'list:"'.$atts['list'].'",':'');
by
$options .= ((isset($atts['limit']))?'limit:'.$atts['limit'].',':'');
$options .= ((isset($atts['query']))?'query:"'.$atts['query'].'",':'');
$options .= ((isset($atts['list']))?'list:"'.$atts['list'].'",':'');
if(!isset($atts['id'])) $atts['id'] = '';
and after
Notice: Use of undefined constant mtf_create_shortcode - assumed 'mtf_create_shortcode' in /home/websites/origin/wordpress/online/wp-content/plugins/mini-twitter-feed/mini-twitter-feed.php on line 61
made me replace
add_shortcode('minitwitter', mtf_create_shortcode);
by
add_shortcode('minitwitter', 'mtf_create_shortcode');
http://wordpress.org/extend/plugins/mini-twitter-feed/
I hope its developer will include these changes into a new update