diff --git a/src/Controller/PostController.php b/src/Controller/PostController.php
index c1ab214..80be5ef 100644
--- a/src/Controller/PostController.php
+++ b/src/Controller/PostController.php
@@ -20,14 +20,14 @@
 use Doctrine\ORM\EntityManagerInterface;
 use IntlDateFormatter;
 use PHPUnit\Util\Json;
+use Sensio\Bundle\FrameworkExtraBundle\Configuration\IsGranted;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\StreamedResponse;
-use Symfony\Component\Routing\Annotation\Route;
-use Sensio\Bundle\FrameworkExtraBundle\Configuration\IsGranted;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Symfony\Component\Routing\Annotation\Route;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 
 class PostController extends ControllerBase
@@ -84,7 +84,7 @@ public function editPost(
         CommonsRepository $commonsRepository,
         $id = null
     ) {
-        $post = $id ? $postRepository->find($id) : new Post();
+        $post = $id ? $postRepository->find($id) : $postRepository->factory();
         if ($request->get('in_reply_to')) {
             $post->setInReplyTo($postRepository->find($request->get('in_reply_to')));
         }
diff --git a/src/Controller/SettingController.php b/src/Controller/SettingController.php
index e5e0692..fd4fe92 100644
--- a/src/Controller/SettingController.php
+++ b/src/Controller/SettingController.php
@@ -2,13 +2,14 @@
 
 namespace App\Controller;
 
+use App\Repository\UserGroupRepository;
 use App\Settings;
+use OAuth\Common\Storage\Session;
 use Samwilson\PhpFlickr\PhpFlickr;
-use Symfony\Component\HttpFoundation\Request;
-use Symfony\Component\Routing\Annotation\Route;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\IsGranted;
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use OAuth\Common\Storage\Session;
+use Symfony\Component\Routing\Annotation\Route;
 use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
 
 class SettingController extends ControllerBase
@@ -31,10 +32,11 @@ public function save(Request $request, Settings $settings)
      * @Route("/settings", name="settings")
      * @isGranted("ROLE_ADMIN")
      */
-    public function index()
+    public function index(UserGroupRepository $userGroupRepository)
     {
         return $this->render('setting/index.html.twig', [
             'controller_name' => 'SettingController',
+            'user_groups' => $userGroupRepository->findAll(),
         ]);
     }
 
diff --git a/src/Entity/Post.php b/src/Entity/Post.php
index 66a0c54..06ee57c 100644
--- a/src/Entity/Post.php
+++ b/src/Entity/Post.php
@@ -3,7 +3,6 @@
 namespace App\Entity;
 
 use App\Repository\PostRepository;
-use LongitudeOne\Spatial\PHP\Types\Geometry\Point;
 use DateTime;
 use DateTimeInterface;
 use DateTimeZone;
@@ -12,6 +11,7 @@
 use Doctrine\ORM\Mapping as ORM;
 use Doctrine\ORM\Mapping\Index;
 use Doctrine\ORM\Mapping\Table;
+use LongitudeOne\Spatial\PHP\Types\Geometry\Point;
 
 /**
  * @ORM\Entity(repositoryClass=PostRepository::class)
@@ -237,6 +237,10 @@ public function getInReplyTo(): ?self
     public function setInReplyTo(?self $in_reply_to): self
     {
         $this->in_reply_to = $in_reply_to;
+        if (!$this->getId()) {
+            // For new posts, set the view group to match the parent post.
+            $this->setViewGroup($in_reply_to->getViewGroup());
+        }
 
         return $this;
     }
@@ -329,21 +333,4 @@ public function canBeViewedBy(?User $user = null): bool
         }
         return $user && $user->isInGroup($this->getViewGroup());
     }
-
-    /**
-     * Find out whether a given group should be selected for this post.
-     * @param UserGroup $group
-     * @return bool
-     */
-    public function isSelectedGroup(UserGroup $group): bool
-    {
-        $g = false;
-        if ($this->getViewGroup()) {
-            $g = $this->getViewGroup();
-        }
-        if ($this->getInReplyTo()) {
-            $g = $this->getInReplyTo()->getViewGroup();
-        }
-        return $g && $g->getId() == $group->getId();
-    }
 }
diff --git a/src/Repository/PostRepository.php b/src/Repository/PostRepository.php
index 04c60cd..7ecfd2f 100644
--- a/src/Repository/PostRepository.php
+++ b/src/Repository/PostRepository.php
@@ -6,7 +6,7 @@
 use App\Entity\Syndication;
 use App\Entity\User;
 use App\Entity\UserGroup;
-use LongitudeOne\Spatial\PHP\Types\Geometry\Point;
+use App\Settings;
 use DateTime;
 use DateTimeZone;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
@@ -16,6 +16,7 @@
 use Doctrine\Persistence\ManagerRegistry;
 use Exception;
 use IntlDateFormatter;
+use LongitudeOne\Spatial\PHP\Types\Geometry\Point;
 use Symfony\Component\HttpFoundation\File\UploadedFile;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Process\Process;
@@ -42,13 +43,17 @@ class PostRepository extends ServiceEntityRepository
     /** @var UserGroupRepository */
     private $userGroupRepository;
 
+    /** @var Settings */
+    private $settings;
+
     public function __construct(
         ManagerRegistry $registry,
         ContactRepository $contactRepository,
         TagRepository $tagRepository,
         FileRepository $fileRepository,
         SyndicationRepository $syndicationRepository,
-        UserGroupRepository $userGroupRepository
+        UserGroupRepository $userGroupRepository,
+        Settings $settings
     ) {
         parent::__construct($registry, Post::class);
         $this->contactRepository = $contactRepository;
@@ -56,6 +61,7 @@ public function __construct(
         $this->fileRepository = $fileRepository;
         $this->syndicationRepository = $syndicationRepository;
         $this->userGroupRepository = $userGroupRepository;
+        $this->settings = $settings;
     }
 
     private function createQueryBuilderForPosts(?User $user = null): QueryBuilder
@@ -68,6 +74,14 @@ private function createQueryBuilderForPosts(?User $user = null): QueryBuilder
             ->andWhere("p.view_group IN ($groupList)");
     }
 
+    public function factory(): Post
+    {
+        $post = new Post();
+        $ug = $this->userGroupRepository->find($this->settings->defaultGroup());
+        $post->setViewGroup($ug);
+        return $post;
+    }
+
     /**
      * @inheritDoc
      */
diff --git a/src/Settings.php b/src/Settings.php
index 2c10a2b..fda7e76 100644
--- a/src/Settings.php
+++ b/src/Settings.php
@@ -4,6 +4,8 @@
 
 use App\Entity\Contact;
 use App\Entity\Setting;
+use App\Entity\User;
+use App\Entity\UserGroup;
 use App\Repository\ContactRepository;
 use App\Repository\SettingRepository;
 use Doctrine\ORM\EntityManagerInterface;
@@ -126,6 +128,11 @@ public function getMainContact(): ?Contact
         return $this->mainContact;
     }
 
+    public function defaultGroup(): int
+    {
+        return (int)($this->getData()['default_group'] ?? UserGroup::PUBLIC);
+    }
+
     public function getSiteJs(): string
     {
         return $this->getData()['site_js'] ?? '';
diff --git a/templates/post/form.html.twig b/templates/post/form.html.twig
index 51ca4fe..0de30af 100644
--- a/templates/post/form.html.twig
+++ b/templates/post/form.html.twig
@@ -59,7 +59,7 @@
                 <label for="view_group">Viewers:</label>
                 <select name="view_group" id="view_group" tabindex="50">
                     {% for g in user_groups %}
-                        <option value="{{ g.id }}" {% if post.isSelectedGroup(g) %}selected{% endif %}>{{ g.name }}</option>
+                        <option value="{{ g.id }}" {% if post.getViewGroup.id == g.id %}selected{% endif %}>{{ g.name }}</option>
                     {% endfor %}
                 </select>
             </span>
diff --git a/templates/setting/index.html.twig b/templates/setting/index.html.twig
index 2d2b06a..1fe64b2 100644
--- a/templates/setting/index.html.twig
+++ b/templates/setting/index.html.twig
@@ -18,8 +18,18 @@
         </p>
 
         <p class="fields">
-            <label for="user_registrations">Allow user registrations?</label>
-            <input id="user_registrations" type="checkbox" {% if settings.userRegistrations %}checked{% endif %} name="settings[user_registrations]" />
+            <span class="field size-1">
+                <label for="user_registrations">Allow user registrations?</label>
+                <input id="user_registrations" type="checkbox" {% if settings.userRegistrations %}checked{% endif %} name="settings[user_registrations]" />
+            </span>
+            <span class="field size-4">
+                <label for="default_group">{{ 'settings.default_group'|trans }}</label>
+                <select id="default_group" name="settings[default_group]">
+                    {% for group in user_groups %}
+                        <option value="{{ group.id }}" {% if group.id == settings.defaultGroup %}selected{% endif %}>{{ group.name }}</option>
+                    {% endfor %}
+                </select>
+            </span>
         </p>
 
         <p class="fields">
diff --git a/tests/Controller/MapControllerTest.php b/tests/Controller/MapControllerTest.php
index 4ce51db..604c309 100644
--- a/tests/Controller/MapControllerTest.php
+++ b/tests/Controller/MapControllerTest.php
@@ -2,8 +2,8 @@
 
 namespace App\Tests;
 
-use App\Tests\Controller\ControllerTestBase;
 use App\Repository\TrackPointRepository;
+use App\Tests\Controller\ControllerTestBase;
 use Symfony\Bundle\FrameworkBundle\KernelBrowser;
 
 class MapControllerTest extends ControllerTestBase
diff --git a/translations/messages.en.yaml b/translations/messages.en.yaml
index 3a01553..a243c3e 100644
--- a/translations/messages.en.yaml
+++ b/translations/messages.en.yaml
@@ -28,6 +28,7 @@ posts:
         is_family: 'Famiy'
 settings:
     title: 'Site Settings'
+    default_group: 'Default group:'
     location_legend: 'GPS tracking'
     overland_key: 'Overland key:'
     overland_help: "Enter the following URL in %overland_link% as the 'Receiver Endpoint':"