diff --git a/src/Plugin/MediaEntity/Type/Twitter.php b/src/Plugin/MediaEntity/Type/Twitter.php
index 18fa450..b01d4f7 100644
--- a/src/Plugin/MediaEntity/Type/Twitter.php
+++ b/src/Plugin/MediaEntity/Type/Twitter.php
@@ -2,14 +2,15 @@
 
 namespace Drupal\media_entity_twitter\Plugin\MediaEntity\Type;
 
+use Drupal\Component\Serialization\Json;
 use Drupal\Core\Config\ConfigFactoryInterface;
 use Drupal\Core\Entity\EntityFieldManagerInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\field\Entity\FieldStorageConfig;
 use Drupal\media_entity\MediaInterface;
 use Drupal\media_entity\MediaTypeBase;
 use Drupal\media_entity\MediaTypeException;
-use Drupal\Component\Serialization\Json;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
@@ -24,6 +25,11 @@ use Symfony\Component\DependencyInjection\ContainerInterface;
 class Twitter extends MediaTypeBase {
 
   /**
+   * The name of the default source field on the media entity.
+   */
+  const MEDIA_ENTITY_TWITTER_DEFAULT_FIELD_NAME = 'field_media_twitter';
+
+  /**
    * Config factory service.
    *
    * @var \Drupal\Core\Config\ConfigFactoryInterface
@@ -199,6 +205,7 @@ class Twitter extends MediaTypeBase {
       '#description' => $this->t('Field on media entity that stores Twitter embed code or URL. You can create a bundle without selecting a value for this dropdown initially. This dropdown can be populated after adding fields to the bundle.'),
       '#default_value' => empty($this->configuration['source_field']) ? NULL : $this->configuration['source_field'],
       '#options' => $options,
+      '#weight' => -10,
     );
 
     $form['use_twitter_api'] = array(
@@ -399,4 +406,22 @@ class Twitter extends MediaTypeBase {
     return parent::getDefaultName($media);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getDefaultSourceField() {
+    if (!$storage = FieldStorageConfig ::loadByName('media', static::MEDIA_ENTITY_TWITTER_DEFAULT_FIELD_NAME)) {
+      $storage = FieldStorageConfig::create([
+        'field_name' => static::MEDIA_ENTITY_TWITTER_DEFAULT_FIELD_NAME,
+        'entity_type' => 'media',
+        'type' => 'string',
+      ]);
+    }
+    return [
+      'storage' => $storage,
+      'field_name' => static::MEDIA_ENTITY_TWITTER_DEFAULT_FIELD_NAME,
+      'label' => $this->t('Tweet URL'),
+    ];
+  }
+
 }