diff --git a/server/index.ts b/server/index.ts
index ffcb323..3c35319 100644
--- a/server/index.ts
+++ b/server/index.ts
@@ -101,6 +101,7 @@ app.use((req, res, next) => {
         }
         
         console.log(`✅ Video found for social bot: ${video.title}`);
+        console.log(`📷 Original thumbnail: ${video.thumbnailUrl}`);
 
         // Preberemo osnovni HTML template
         const clientTemplate = path.resolve(import.meta.dirname, "..", "client", "index.html");
@@ -114,7 +115,16 @@ app.use((req, res, next) => {
         // Use short ID for sharing URLs
         const shortId = video.id.replace(/-/g, '').substring(0, 8);
         const videoUrl = `${baseUrl}/video/${shortId}`;
-        const thumbnailUrl = video.thumbnailUrl || `${baseUrl}/api/video-thumbnail/${video.id}`;
+        // Optimize thumbnail for social media sharing - larger size and JPEG format
+        let thumbnailUrl = video.thumbnailUrl;
+        if (thumbnailUrl) {
+          // Replace small WebP with larger JPEG for better social media compatibility
+          thumbnailUrl = thumbnailUrl
+            .replace('width=400&height=225', 'width=1200&height=630')
+            .replace('format=webp', 'format=jpg');
+        } else {
+          thumbnailUrl = `${baseUrl}/api/video-thumbnail/${video.id}`;
+        }
         
         // Zamenjamo osnovne meta oznake
         template = template.replace(