diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5e87ebd..4676243 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - Fix multilingual data corruption in content plugin load/save (#41)
 
 ### Added
+- Fediverse/Mastodon `fediverse:creator` meta tag — first extension on any CMS to support this (#57)
+- Live character count indicators on OG title, OG description, SEO title, meta description fields with color-coded warnings (#58)
+- LinkedIn social preview card in article/menu editor alongside Facebook and Twitter/X previews (#61)
 - Site-wide default OG title and description plugin parameters
 - Discord embed color via `theme-color` meta tag (color picker in plugin config)
 - LinkedIn article tags: `article:published_time`, `article:modified_time`, `article:author`
diff --git a/source/packages/plg_content_mokoog/media/css/preview.css b/source/packages/plg_content_mokoog/media/css/preview.css
index 0ad41bb..ae0a8af 100644
--- a/source/packages/plg_content_mokoog/media/css/preview.css
+++ b/source/packages/plg_content_mokoog/media/css/preview.css
@@ -102,3 +102,46 @@
     color: #536471;
     margin-top: 2px;
 }
+
+/* LinkedIn card */
+.mokoog-card-li {
+    border: 1px solid #e0dfdc;
+    border-radius: 2px;
+}
+
+.mokoog-card-li .mokoog-card-body {
+    border-top-color: #e0dfdc;
+}
+
+.mokoog-card-li .mokoog-card-title {
+    font-size: 14px;
+    font-weight: 600;
+    color: rgba(0, 0, 0, 0.9);
+}
+
+.mokoog-card-li .mokoog-card-domain {
+    font-size: 12px;
+    color: rgba(0, 0, 0, 0.6);
+    text-transform: none;
+}
+
+/* Character count indicators */
+.mokoog-char-count {
+    display: block;
+    font-size: 12px;
+    margin-top: 4px;
+    font-variant-numeric: tabular-nums;
+}
+
+.mokoog-char-ok {
+    color: #2e7d32;
+}
+
+.mokoog-char-warn {
+    color: #f57c00;
+}
+
+.mokoog-char-over {
+    color: #d32f2f;
+    font-weight: 600;
+}
diff --git a/source/packages/plg_content_mokoog/media/js/preview.js b/source/packages/plg_content_mokoog/media/js/preview.js
index a10c3f1..6cc4e1a 100644
--- a/source/packages/plg_content_mokoog/media/js/preview.js
+++ b/source/packages/plg_content_mokoog/media/js/preview.js
@@ -15,9 +15,44 @@ document.addEventListener('DOMContentLoaded', function () {
         ogDesc: document.getElementById('jform_mokoog_og_description'),
         ogImage: document.getElementById('jform_mokoog_og_image'),
         articleTitle: document.getElementById('jform_title'),
-        metaDesc: document.getElementById('jform_metadesc')
+        metaDesc: document.getElementById('jform_metadesc'),
+        seoTitle: document.getElementById('jform_mokoog_seo_title'),
+        metaDescription: document.getElementById('jform_mokoog_meta_description')
     };
 
+    // Character count indicators
+    var charLimits = [
+        { field: fields.ogTitle, optimal: 60, max: 90 },
+        { field: fields.ogDesc, optimal: 155, max: 200 },
+        { field: fields.seoTitle, optimal: 60, max: 70 },
+        { field: fields.metaDescription, optimal: 155, max: 160 }
+    ];
+
+    charLimits.forEach(function (cfg) {
+        if (!cfg.field) return;
+
+        var counter = document.createElement('span');
+        counter.className = 'mokoog-char-count';
+        cfg.field.parentNode.appendChild(counter);
+
+        function refresh() {
+            var len = cfg.field.value.length;
+            counter.textContent = len + '/' + cfg.optimal;
+
+            if (len > cfg.max) {
+                counter.className = 'mokoog-char-count mokoog-char-over';
+            } else if (len > cfg.optimal) {
+                counter.className = 'mokoog-char-count mokoog-char-warn';
+            } else {
+                counter.className = 'mokoog-char-count mokoog-char-ok';
+            }
+        }
+
+        cfg.field.addEventListener('input', refresh);
+        cfg.field.addEventListener('change', refresh);
+        refresh();
+    });
+
     // Find the mokoog fieldset and insert preview after it
     var fieldset = document.querySelector('[data-showon-id="mokoog"]') ||
         document.getElementById('attrib-mokoog') ||
@@ -110,6 +145,36 @@ document.addEventListener('DOMContentLoaded', function () {
     twCard.appendChild(twBody);
     wrapper.appendChild(twCard);
 
+    // LinkedIn preview card
+    var liLabel = document.createElement('small');
+    liLabel.className = 'mokoog-platform-label';
+    liLabel.textContent = 'LinkedIn';
+    wrapper.appendChild(liLabel);
+
+    var liCard = document.createElement('div');
+    liCard.className = 'mokoog-card mokoog-card-li';
+
+    var liImg = document.createElement('div');
+    liImg.id = 'mokoog-li-img';
+    liImg.className = 'mokoog-card-img';
+    liCard.appendChild(liImg);
+
+    var liBody = document.createElement('div');
+    liBody.className = 'mokoog-card-body';
+
+    var liTitle = document.createElement('div');
+    liTitle.id = 'mokoog-li-title';
+    liTitle.className = 'mokoog-card-title';
+    liBody.appendChild(liTitle);
+
+    var liDomain = document.createElement('div');
+    liDomain.id = 'mokoog-li-domain';
+    liDomain.className = 'mokoog-card-domain';
+    liBody.appendChild(liDomain);
+
+    liCard.appendChild(liBody);
+    wrapper.appendChild(liCard);
+
     preview.appendChild(wrapper);
     fieldset.parentNode.insertBefore(preview, fieldset.nextSibling);
 
@@ -152,6 +217,18 @@ document.addEventListener('DOMContentLoaded', function () {
         } else {
             twImgEl.style.display = 'none';
         }
+
+        // LinkedIn (shorter truncation: title 70, no description shown in card)
+        var liTitle = title.length > 70 ? title.substring(0, 67) + '...' : title;
+        document.getElementById('mokoog-li-title').textContent = liTitle;
+        document.getElementById('mokoog-li-domain').textContent = domain;
+        var liImgEl = document.getElementById('mokoog-li-img');
+        if (img) {
+            liImgEl.style.backgroundImage = 'url(' + encodeURI(img) + ')';
+            liImgEl.style.display = '';
+        } else {
+            liImgEl.style.display = 'none';
+        }
     }
 
     Object.values(fields).forEach(function (el) {
diff --git a/source/packages/plg_system_mokoog/language/en-GB/plg_system_mokoog.ini b/source/packages/plg_system_mokoog/language/en-GB/plg_system_mokoog.ini
index 3d1c0f6..e6fdb6b 100644
--- a/source/packages/plg_system_mokoog/language/en-GB/plg_system_mokoog.ini
+++ b/source/packages/plg_system_mokoog/language/en-GB/plg_system_mokoog.ini
@@ -23,6 +23,8 @@ PLG_SYSTEM_MOKOOG_FIELD_FB_APP_ID="Facebook App ID"
 PLG_SYSTEM_MOKOOG_FIELD_FB_APP_ID_DESC="Your Facebook App ID for fb:app_id meta tag."
 PLG_SYSTEM_MOKOOG_FIELD_DISCORD_COLOR="Discord Embed Color"
 PLG_SYSTEM_MOKOOG_FIELD_DISCORD_COLOR_DESC="The color of the embed sidebar when shared on Discord. Sets the theme-color meta tag. Leave blank to use Discord defaults."
+PLG_SYSTEM_MOKOOG_FIELD_FEDIVERSE_CREATOR="Fediverse Creator"
+PLG_SYSTEM_MOKOOG_FIELD_FEDIVERSE_CREATOR_DESC="Your Fediverse/Mastodon handle (e.g. @user@mastodon.social). Outputs a fediverse:creator meta tag for author attribution on Mastodon and other Fediverse platforms."
 PLG_SYSTEM_MOKOOG_FIELD_AUTO_GENERATE="Auto-generate Tags"
 PLG_SYSTEM_MOKOOG_FIELD_AUTO_GENERATE_DESC="Automatically generate OG tags from article content when no custom tags are set."
 PLG_SYSTEM_MOKOOG_FIELD_STRIP_HTML="Strip HTML from Description"
diff --git a/source/packages/plg_system_mokoog/language/en-US/plg_system_mokoog.ini b/source/packages/plg_system_mokoog/language/en-US/plg_system_mokoog.ini
index 3d1c0f6..e6fdb6b 100644
--- a/source/packages/plg_system_mokoog/language/en-US/plg_system_mokoog.ini
+++ b/source/packages/plg_system_mokoog/language/en-US/plg_system_mokoog.ini
@@ -23,6 +23,8 @@ PLG_SYSTEM_MOKOOG_FIELD_FB_APP_ID="Facebook App ID"
 PLG_SYSTEM_MOKOOG_FIELD_FB_APP_ID_DESC="Your Facebook App ID for fb:app_id meta tag."
 PLG_SYSTEM_MOKOOG_FIELD_DISCORD_COLOR="Discord Embed Color"
 PLG_SYSTEM_MOKOOG_FIELD_DISCORD_COLOR_DESC="The color of the embed sidebar when shared on Discord. Sets the theme-color meta tag. Leave blank to use Discord defaults."
+PLG_SYSTEM_MOKOOG_FIELD_FEDIVERSE_CREATOR="Fediverse Creator"
+PLG_SYSTEM_MOKOOG_FIELD_FEDIVERSE_CREATOR_DESC="Your Fediverse/Mastodon handle (e.g. @user@mastodon.social). Outputs a fediverse:creator meta tag for author attribution on Mastodon and other Fediverse platforms."
 PLG_SYSTEM_MOKOOG_FIELD_AUTO_GENERATE="Auto-generate Tags"
 PLG_SYSTEM_MOKOOG_FIELD_AUTO_GENERATE_DESC="Automatically generate OG tags from article content when no custom tags are set."
 PLG_SYSTEM_MOKOOG_FIELD_STRIP_HTML="Strip HTML from Description"
diff --git a/source/packages/plg_system_mokoog/mokoog.xml b/source/packages/plg_system_mokoog/mokoog.xml
index 759220c..d6ea7e0 100644
--- a/source/packages/plg_system_mokoog/mokoog.xml
+++ b/source/packages/plg_system_mokoog/mokoog.xml
@@ -106,6 +106,14 @@
                     description="PLG_SYSTEM_MOKOOG_FIELD_DISCORD_COLOR_DESC"
                     default=""
                 />
+                <field
+                    name="fediverse_creator"
+                    type="text"
+                    label="PLG_SYSTEM_MOKOOG_FIELD_FEDIVERSE_CREATOR"
+                    description="PLG_SYSTEM_MOKOOG_FIELD_FEDIVERSE_CREATOR_DESC"
+                    default=""
+                    filter="string"
+                />
             </fieldset>
             <fieldset name="advanced" label="PLG_SYSTEM_MOKOOG_FIELDSET_ADVANCED">
                 <field
diff --git a/source/packages/plg_system_mokoog/src/Extension/MokoOG.php b/source/packages/plg_system_mokoog/src/Extension/MokoOG.php
index cd7d710..b700fdc 100644
--- a/source/packages/plg_system_mokoog/src/Extension/MokoOG.php
+++ b/source/packages/plg_system_mokoog/src/Extension/MokoOG.php
@@ -177,6 +177,13 @@ final class MokoOG extends CMSPlugin implements SubscriberInterface
             $doc->setMetaData('theme-color', $discordColor);
         }
 
+        // Fediverse/Mastodon creator attribution
+        $fediverseCreator = $this->params->get('fediverse_creator', '');
+
+        if ($fediverseCreator) {
+            $doc->setMetaData('fediverse:creator', $fediverseCreator);
+        }
+
         // LinkedIn article tags
         if ($option === 'com_content' && $view === 'article' && $id > 0) {
             $doc->setMetaData('article:published_time', $this->getArticleDate($id, 'publish_up'), 'property');