Update "Platform-Support.-"

Platform-Support.-.md

@@ -26,10 +26,18 @@ MokoSuiteOpenGraph outputs platform-specific meta tags optimized for each social
 - Reads standard `og:*` tags
 - `telegram:channel` for channel link previews
 
+### Mastodon / Fediverse
+- Reads standard `og:*` tags
+- `fediverse:creator` for author attribution (e.g. `@user@mastodon.social`)
+- **First extension on any CMS** to support this tag (introduced by Mastodon mid-2024)
+
 ### WhatsApp
 - Reads standard `og:*` tags
 - Images auto-resized to meet minimum 300x200px requirement
 
+### Slack / Reddit
+- Read standard `og:*` tags natively — no special tags needed
+
 ### E-commerce / Product Pages
 - `og:type` set to `product` on MokoSuiteShop product pages
 - `product:price:amount` and `product:price:currency` for rich product previews
@@ -49,3 +57,13 @@ MokoSuiteOpenGraph outputs platform-specific meta tags optimized for each social
 - `WebPage` schema with name, description, URL
 - `BreadcrumbList` schema from Joomla pathway (optional)
 - `Organization` schema from site configuration
+
+## Editor Preview Cards
+
+When editing articles or menu items, live preview cards show how your content will appear on:
+
+- **Facebook** — standard link preview card with image, title, description
+- **Twitter / X** — large image card with rounded corners
+- **LinkedIn** — professional card with image and title
+
+All previews update in real-time as you type. Character count indicators show green/yellow/red warnings when text exceeds platform limits.