diff --git a/journal/templates/comment.html b/journal/templates/comment.html
index b316f3f9..47b0e6a1 100644
--- a/journal/templates/comment.html
+++ b/journal/templates/comment.html
@@ -25,7 +25,7 @@
         <textarea name="text" cols="40" rows="10" placeholder="超过360字部分实例可能无法显示" maxlength="360" id="id_text">{% if comment.text %}{{ comment.text }}{% endif %}</textarea>
 
         <div class="mark-modal__share-checkbox float-right">
-          <label for="id_share_to_mastodon"><input type="checkbox" name="share_to_mastodon" id="id_share_to_mastodon" value="1" checked>分享到联邦网络</label>
+          <label for="id_share_to_mastodon"><input type="checkbox" name="share_to_mastodon" id="id_share_to_mastodon" value="1" {%if not request.user.preference.default_no_share %}checked{% endif %}>分享到联邦网络</label>
         </div>
 
         <div class="mark-modal__option">
diff --git a/journal/templates/mark.html b/journal/templates/mark.html
index 37b4ef25..a4641fbb 100644
--- a/journal/templates/mark.html
+++ b/journal/templates/mark.html
@@ -45,7 +45,7 @@
       </div>
 
       <div class="mark-modal__share-checkbox float-right">
-        <label for="id_share_to_mastodon"><input type="checkbox" name="share_to_mastodon" id="id_share_to_mastodon" value="1" checked>分享到联邦网络</label>
+        <label for="id_share_to_mastodon"><input type="checkbox" name="share_to_mastodon" id="id_share_to_mastodon" value="1" {%if not request.user.preference.default_no_share %}checked{% endif %}>分享到联邦网络</label>
       </div>
 
       <div class="mark-modal__option">
diff --git a/users/data.py b/users/data.py
index ab868988..ee3cec75 100644
--- a/users/data.py
+++ b/users/data.py
@@ -38,6 +38,7 @@ def preferences(request):
     preference = request.user.get_preference()
     if request.method == "POST":
         preference.default_visibility = int(request.POST.get("default_visibility"))
+        preference.default_no_share = bool(request.POST.get("default_no_share"))
         preference.classic_homepage = bool(request.POST.get("classic_homepage"))
         preference.mastodon_publish_public = bool(
             request.POST.get("mastodon_publish_public")
@@ -49,6 +50,7 @@ def preferences(request):
         preference.save(
             update_fields=[
                 "default_visibility",
+                "default_no_share",
                 "classic_homepage",
                 "mastodon_publish_public",
                 "mastodon_append_tag",
diff --git a/users/migrations/0002_preference_default_no_share.py b/users/migrations/0002_preference_default_no_share.py
new file mode 100644
index 00000000..88d1ef28
--- /dev/null
+++ b/users/migrations/0002_preference_default_no_share.py
@@ -0,0 +1,17 @@
+# Generated by Django 3.2.16 on 2023-02-12 13:43
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("users", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="preference",
+            name="default_no_share",
+            field=models.BooleanField(default=False),
+        ),
+    ]
diff --git a/users/models.py b/users/models.py
index eda71a74..21264dbe 100644
--- a/users/models.py
+++ b/users/models.py
@@ -214,6 +214,7 @@ class Preference(models.Model):
     import_status = models.JSONField(
         blank=True, null=True, encoder=DjangoJSONEncoder, default=dict
     )
+    default_no_share = models.BooleanField(default=False)
     default_visibility = models.PositiveSmallIntegerField(default=0)
     classic_homepage = models.BooleanField(null=False, default=False)
     mastodon_publish_public = models.BooleanField(null=False, default=False)
diff --git a/users/templates/users/preferences.html b/users/templates/users/preferences.html
index df449039..96023589 100644
--- a/users/templates/users/preferences.html
+++ b/users/templates/users/preferences.html
@@ -69,8 +69,8 @@
                                         <div class="import-panel__body">
                                             <span>{% trans '在联邦网络上以公开方式分享的帖文是否发布到公共时间轴上：' %}</span>
                                             <div class="import-panel__checkbox import-panel__checkbox--last">
-                                                <input type="checkbox" name="mastodon_publish_public" id="visibility" {%if request.user.preference.mastodon_publish_public %}checked{% endif %}>
-                                                <label for="visibility">{% trans '选中时为public，未选中时为unlisted' %}</label>
+                                                <input type="checkbox" name="mastodon_publish_public" id="mastodon_publish_public" {%if request.user.preference.mastodon_publish_public %}checked{% endif %}>
+                                                <label for="mastodon_publish_public">{% trans '选中时为public，未选中时为unlisted' %}</label>
                                             </div>
                                             <br><br>
                                             <span>{% trans '在联邦网络上分享帖文时附加标签：' %}</span>
@@ -78,6 +78,12 @@
                                                 <input name="mastodon_append_tag" id="tag" placeholder="#我的书影音" value="{{ request.user.preference.mastodon_append_tag }}" >
                                                 <label for="tag">{% trans '输入标签文字会被添加到帖文结尾' %}</label>
                                             </div>
+                                            <br>
+                                            <span>{% trans '默认不分享到联邦网络：' %}</span>
+                                            <div class="import-panel__checkbox import-panel__checkbox--last">
+                                                <input type="checkbox" name="default_no_share" id="default_no_share" {%if request.user.preference.default_no_share %}checked{% endif %}>
+                                                <label for="default_no_share">标记默认分享到联邦网络，除非选中此项</label>
+                                            </div>
                                         </div>
                                     </div>
                                 </div>