diff --git a/controllers/controllers.php b/controllers/controllers.php
index 2e6f1e0..8ffaedb 100644
--- a/controllers/controllers.php
+++ b/controllers/controllers.php
@@ -444,16 +444,18 @@ $app->get('/reply/preview', function() use($app) {
     if($entry) {
       if(array_key_exists('author', $entry)) {
         // Find all @-names in the post, as well as the author name
-        $mentions[] = $entry['author']['nickname'];
+        $mentions[] = strtolower($entry['author']['nickname']);
       }
 
       if(preg_match_all('/(^|(?<=[\s\/]))@([a-z0-9_]+([a-z0-9_\.]*)?)/i', $entry['content']['text'], $matches)) {
         foreach($matches[0] as $nick) {
           if(trim($nick,'@') != $user->twitter_username && trim($nick,'@') != display_url($user->url))
-            $mentions[] = trim($nick,'@');
+            $mentions[] = strtolower(trim($nick,'@'));
         }
       }
 
+      $mentions = array_values(array_unique($mentions));
+
     }    
 
     $app->response()['Content-type'] = 'application/json';