diff --git a/config/default/core.entity_form_display.node.post.default.yml b/config/default/core.entity_form_display.node.post.default.yml
index 99bc3fc..96be121 100644
--- a/config/default/core.entity_form_display.node.post.default.yml
+++ b/config/default/core.entity_form_display.node.post.default.yml
@@ -129,4 +129,5 @@ content:
     settings: {  }
     third_party_settings: {  }
 hidden:
+  field_external_link: true
   field_sent_to_social_media: true
diff --git a/config/default/core.entity_view_display.node.post.default.yml b/config/default/core.entity_view_display.node.post.default.yml
index bad63da..8203254 100644
--- a/config/default/core.entity_view_display.node.post.default.yml
+++ b/config/default/core.entity_view_display.node.post.default.yml
@@ -51,6 +51,7 @@ content:
     third_party_settings: {  }
 hidden:
   field_excerpt: true
+  field_external_link: true
   field_has_tweet: true
   field_images: true
   field_series: true
diff --git a/config/default/core.entity_view_display.node.post.teaser.yml b/config/default/core.entity_view_display.node.post.teaser.yml
index 6c4f01b..a1e15ce 100644
--- a/config/default/core.entity_view_display.node.post.teaser.yml
+++ b/config/default/core.entity_view_display.node.post.teaser.yml
@@ -33,6 +33,7 @@ content:
     third_party_settings: {  }
 hidden:
   body: true
+  field_external_link: true
   field_has_tweet: true
   field_images: true
   field_sent_to_social_media: true
diff --git a/config/default/field.field.node.post.field_external_link.yml b/config/default/field.field.node.post.field_external_link.yml
new file mode 100644
index 0000000..e120bb0
--- /dev/null
+++ b/config/default/field.field.node.post.field_external_link.yml
@@ -0,0 +1,23 @@
+uuid: 09df4309-5909-4347-ae8a-e35f84e1930d
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.node.field_external_link
+    - node.type.post
+  module:
+    - link
+id: node.post.field_external_link
+field_name: field_external_link
+entity_type: node
+bundle: post
+label: 'External link'
+description: ''
+required: false
+translatable: false
+default_value: {  }
+default_value_callback: ''
+settings:
+  link_type: 16
+  title: 2
+field_type: link
diff --git a/config/default/field.storage.node.field_external_link.yml b/config/default/field.storage.node.field_external_link.yml
new file mode 100644
index 0000000..48094ed
--- /dev/null
+++ b/config/default/field.storage.node.field_external_link.yml
@@ -0,0 +1,19 @@
+uuid: 2faf15c2-a456-485c-b7bd-30ff75e4cc21
+langcode: en
+status: true
+dependencies:
+  module:
+    - link
+    - node
+id: node.field_external_link
+field_name: field_external_link
+entity_type: node
+type: link
+settings: {  }
+module: link
+locked: false
+cardinality: 1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false
diff --git a/web/modules/custom/custom/hooks/node_links/alter.inc b/web/modules/custom/custom/hooks/node_links/alter.inc
new file mode 100644
index 0000000..e49cfa9
--- /dev/null
+++ b/web/modules/custom/custom/hooks/node_links/alter.inc
@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * @file
+ * Node links alter hooks.
+ */
+
+declare(strict_types=1);
+
+use Drupal\Core\Url;
+use Drupal\node\NodeInterface;
+
+/**
+ * Implements hook_node_links_alter().
+ */
+function custom_node_links_alter(array &$links, NodeInterface $node): void {
+  if (!method_exists($node, 'getExternalLink')) {
+    return;
+  }
+
+  if ($link = $node->getExternalLink()) {
+    $links['node']['#links']['node-readmore']['url'] = Url::fromUri($link['uri']);
+    $links['node']['#links']['node-readmore']['title'] = t('Read more<span class="visually-hidden"> about @title</span> (<span class="visually-hidden">on </span>@domain)', [
+      '@domain' => $link['title'],
+      '@title' => $node->label(),
+    ]);
+  }
+}
diff --git a/web/modules/custom/custom/hooks/preprocess/node.inc b/web/modules/custom/custom/hooks/preprocess/node.inc
new file mode 100644
index 0000000..aabde2b
--- /dev/null
+++ b/web/modules/custom/custom/hooks/preprocess/node.inc
@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @file
+ * Node preprocess functions.
+ */
+
+declare(strict_types=1);
+
+/**
+ * Implements hook_preprocess_HOOK().
+ */
+function custom_preprocess_node(array &$variables): void {
+  if (!method_exists($variables['node'], 'getExternalLink')) {
+    return;
+  }
+
+  if ($link = $variables['node']->getExternalLink()) {
+    $variables['url'] = $link['uri'];
+  }
+}
diff --git a/web/modules/custom/custom/src/Entity/Node/Post.php b/web/modules/custom/custom/src/Entity/Node/Post.php
index 4f33f9b..b119c3c 100644
--- a/web/modules/custom/custom/src/Entity/Node/Post.php
+++ b/web/modules/custom/custom/src/Entity/Node/Post.php
@@ -18,6 +18,12 @@ use Drupal\node\Entity\Node;
  */
 class Post extends Node implements ContentEntityBundleInterface {
 
+  public function getExternalLink(): ?array {
+    return ($link = $this->get('field_external_link')->get(0))
+      ? $link->getValue()
+      : NULL;
+  }
+
   public function hasBeenSentToSocialMedia(): bool {
     return (bool) $this->get('field_sent_to_social_media')->getString();
   }
@@ -26,6 +32,10 @@ class Post extends Node implements ContentEntityBundleInterface {
     return (bool) $this->get('field_has_tweet')->getString();
   }
 
+  public function isExternalPost(): bool {
+    return (bool) $this->getExternalLink();
+  }
+
   public function toTweet(): string {
     // TODO: Add tags.
 
diff --git a/web/modules/custom/custom/src/EventSubscriber/PushBlogPostToSocialMedia.php b/web/modules/custom/custom/src/EventSubscriber/PushBlogPostToSocialMedia.php
index ae1e908..fd6581c 100644
--- a/web/modules/custom/custom/src/EventSubscriber/PushBlogPostToSocialMedia.php
+++ b/web/modules/custom/custom/src/EventSubscriber/PushBlogPostToSocialMedia.php
@@ -7,7 +7,6 @@ namespace Drupal\custom\EventSubscriber;
 use Drupal\custom\Entity\Node\Post;
 use Drupal\hook_event_dispatcher\Event\Entity\BaseEntityEvent;
 use Drupal\hook_event_dispatcher\HookEventDispatcherInterface;
-use Drupal\node\NodeInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 final class PushBlogPostToSocialMedia implements EventSubscriberInterface {
@@ -28,7 +27,7 @@ final class PushBlogPostToSocialMedia implements EventSubscriberInterface {
       return;
     }
 
-    /** @var NodeInterface $entity */
+    /** @var Post $entity */
     if ($entity->bundle() != 'post') {
       return;
     }
@@ -42,6 +41,10 @@ final class PushBlogPostToSocialMedia implements EventSubscriberInterface {
       return;
     }
 
+    if ($entity->isExternalPost()) {
+      return;
+    }
+
     $url = \Drupal::configFactory()->get('opdavies_talks.config')
       ->get('zapier_post_tweet_url');