Search through both name and screen_name.

src/components/post_status_form/post_status_form.js

@@ -49,7 +49,7 @@ const defaultCollection = {
   menuContainer: document.body,
 
   // column to search against in the object (accepts function or string)
-  lookup: 'name',
+  lookup: ({name, screen_name}) => `${name} (@${screen_name})`,
 
   // column that contains the content to insert by default
   fillAttr: 'screen_name',