diff --git a/index.html b/index.html
index 62077a91..09530227 100644
--- a/index.html
+++ b/index.html
@@ -6,10 +6,54 @@
     <link rel="icon" href="/favicon.ico" />
     <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
     <meta name="theme-color" content="#000000" />
-    <meta name="description" content="serverless, adminless, decentralized imageboard" />
+    <meta name="description" content="5chan is a free, open-source, decentralized imageboard built on the Bitsocial protocol. No servers, no admins — all content is shared peer-to-peer via IPFS." />
+    <meta name="author" content="bitsocialhq" />
+    <link rel="canonical" href="https://5chan.app/" />
     <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
     <link rel="manifest" href="/manifest.json" />
-    <title>5chan</title>
+
+    <!-- OpenGraph -->
+    <meta property="og:type" content="website" />
+    <meta property="og:site_name" content="5chan" />
+    <meta property="og:title" content="5chan — Decentralized Imageboard" />
+    <meta property="og:description" content="Free, open-source, serverless imageboard built on the Bitsocial protocol. No servers, no admins — peer-to-peer via IPFS." />
+    <meta property="og:url" content="https://5chan.app/" />
+    <meta property="og:image" content="https://5chan.app/manifest-icon-512x512.png" />
+
+    <!-- Twitter Card -->
+    <meta name="twitter:card" content="summary" />
+    <meta name="twitter:title" content="5chan — Decentralized Imageboard" />
+    <meta name="twitter:description" content="Free, open-source, serverless imageboard built on the Bitsocial protocol. Peer-to-peer via IPFS." />
+    <meta name="twitter:image" content="https://5chan.app/manifest-icon-512x512.png" />
+
+    <!-- Structured Data -->
+    <script type="application/ld+json">
+    {
+      "@context": "https://schema.org",
+      "@type": "WebApplication",
+      "name": "5chan",
+      "url": "https://5chan.app",
+      "description": "Free, open-source, decentralized imageboard built on the Bitsocial protocol. No servers, no admins — all content is shared peer-to-peer via IPFS.",
+      "applicationCategory": "SocialNetworkingApplication",
+      "operatingSystem": "Any",
+      "offers": { "@type": "Offer", "price": "0", "priceCurrency": "USD" },
+      "author": {
+        "@type": "Organization",
+        "name": "bitsocialhq",
+        "url": "https://github.com/bitsocialhq"
+      },
+      "license": "https://www.gnu.org/licenses/old-licenses/gpl-2.0.html",
+      "sourceOrganization": {
+        "@type": "Organization",
+        "name": "bitsocialhq",
+        "url": "https://github.com/bitsocialhq"
+      },
+      "isAccessibleForFree": true,
+      "codeRepository": "https://github.com/bitsocialhq/5chan"
+    }
+    </script>
+
+    <title>5chan — Decentralized Imageboard</title>
     <!-- React Grab: Hold ⌘C and click any element to provide visual context to AI coding agents (dev only) -->
     <script type="module">
       if (import.meta.env.DEV) {
diff --git a/public/manifest.json b/public/manifest.json
index 40f9b7a4..0e003c7c 100644
--- a/public/manifest.json
+++ b/public/manifest.json
@@ -1,6 +1,7 @@
 {
   "short_name": "5chan",
-  "name": "5chan",
+  "name": "5chan — Decentralized Imageboard",
+  "description": "Free, open-source, decentralized imageboard built on the Bitsocial protocol. No servers, no admins — peer-to-peer via IPFS.",
   "icons": [
     {
       "src": "manifest-icon-192x192.png",
@@ -14,5 +15,6 @@
     }
   ],
   "start_url": ".",
-  "display": "standalone"
+  "display": "standalone",
+  "categories": ["social", "news"]
 }
diff --git a/public/robots.txt b/public/robots.txt
index e9e57dc4..e2e2e223 100644
--- a/public/robots.txt
+++ b/public/robots.txt
@@ -1,3 +1,6 @@
 # https://www.robotstxt.org/robotstxt.html
 User-agent: *
 Disallow:
+
+# 5chan — open-source decentralized imageboard
+# Source: https://github.com/bitsocialhq/5chan
diff --git a/vercel.json b/vercel.json
index fda25c70..243b7972 100644
--- a/vercel.json
+++ b/vercel.json
@@ -2,6 +2,18 @@
   "rewrites": [
     { "source": "/(.*)", "destination": "/index.html" }
   ],
+  "headers": [
+    {
+      "source": "/(.*)",
+      "headers": [
+        { "key": "X-Content-Type-Options", "value": "nosniff" },
+        { "key": "X-Frame-Options", "value": "DENY" },
+        { "key": "Referrer-Policy", "value": "no-referrer" },
+        { "key": "Permissions-Policy", "value": "camera=(), microphone=(), geolocation=()" },
+        { "key": "X-DNS-Prefetch-Control", "value": "off" }
+      ]
+    }
+  ],
   "installCommand": "HUSKY=0 YARN_CACHE_FOLDER=/tmp/yarn-cache yarn install --frozen-lockfile --network-timeout 600000 --network-concurrency 1 --child-concurrency 1",
   "buildCommand": "yarn build",
   "outputDirectory": "build",