diff --git a/README.md b/README.md
index e74c69b..bd6d74a 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ A personal, decentralized search engine built on the [Reticulum](https://reticul
 - **Custom templates** — Full HTML/CSS/JS template editor to personalize your instance
 - **Import/export** — JSON-based backup and restore
 - **Mesh-native** — Works over Reticulum without the internet; encrypted and decentralized by default
+- **Forum plugin** — Optional link-sharing discussion board over the mesh (see Forum section below)
 
 ## Performance & Scale
 
@@ -107,6 +108,7 @@ Your data is stored in `~/.tinyweb/`:
 |------|-------------|
 | `index.db` | SQLite database with your indexed pages |
 | `tinyweb_identity` | Your Reticulum identity (keep safe!) |
+| `forum.db` | Forum plugin database (only if forum is enabled) |
 | `models/` | Downloaded AI models for semantic search |
 | `index.hnsw` | Semantic search index |
 
@@ -118,6 +120,7 @@ Back up the whole `~/.tinyweb/` directory periodically. The two files that matte
 
 - **`tinyweb_identity`** is your permanent mesh identity. If you lose it, your destination hash changes and every subscriber has to re-subscribe to the new one. Keep it somewhere you trust; the file is `0600` by default.
 - **`index.db`** is your full reading history — every page, note, tag, and synced remote page. Losing it loses everything you've curated.
+- **`forum.db`** (if the forum plugin is enabled) — all threads, posts, upvotes, and moderation settings. Losing it loses your forum data.
 
 `models/` and `index.hnsw` are re-derivable (the model will re-download, and the HNSW index rebuilds from the database on next startup with semantic search enabled) so they don't need to be backed up.
 
@@ -176,6 +179,27 @@ This connects over Reticulum and serves the remote instance at `http://localhost
 3. **Subscribe** — Add a friend's destination hash on `/subscriptions` to sync their shared index
 4. **Customize** — Edit your site name, HTML template, and sharing settings on `/style`
 
+## Forum plugin
+
+TinyWeb ships with an optional [tinyweb-forum](https://git.derickphan.com/lichenblankie/tinyweb-forum) plugin — a decentralized link-sharing discussion board that runs in-process alongside TinyWeb.
+
+### Install
+
+```bash
+pip install tinyweb-forum
+```
+
+Enable it on the `/style` page under "Forum". A "Forum" link will appear in the navigation bar.
+
+### How it works
+
+- Threads and posts are stored in `~/.tinyweb/forum.db` (separate from your search index)
+- Instances sync forum content over Reticulum every 5 minutes
+- Authors are identified by a short pseudonymous identity hash (no accounts, no sign-up)
+- Moderation is local: block authors, mute threads, keyword filters, and gossip block lists with peers
+
+For full feature docs, see the [tinyweb-forum README](https://git.derickphan.com/lichenblankie/tinyweb-forum).
+
 ## Project structure
 
 ```
diff --git a/app.py b/app.py
index b1c4fe6..3830c85 100644
--- a/app.py
+++ b/app.py
@@ -8,6 +8,8 @@ from http.server import HTTPServer
 
 from db import init_db, get_setting, set_setting
 from handlers import dispatch_request
+import handlers as handlers_mod
+import templates as templates_mod
 import gateway
 from gateway import GatewayState, GatewayHandler
 
@@ -31,6 +33,7 @@ def find_available_port(start=8080, max_attempts=20, host="127.0.0.1"):
     for port in range(start, start + max_attempts):
         try:
             with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+                s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
                 s.bind((host, port))
             return port
         except OSError:
@@ -97,6 +100,7 @@ def rns_request_handler(path, data, request_id, link_id, remote_identity, reques
 def start_gateway(reticulum, bind_host="127.0.0.1"):
     GatewayState.reticulum = reticulum
     GatewayState.local_dispatch = dispatch_request
+    HTTPServer.allow_reuse_address = True
     server = HTTPServer((bind_host, gateway.GATEWAY_PORT), GatewayHandler)
     thread = threading.Thread(target=server.serve_forever, daemon=True)
     thread.start()
@@ -271,6 +275,22 @@ def main():
         allow=RNS.Destination.ALLOW_ALL,
     )
 
+    # Initialize forum plugin if available
+    forum = None
+    try:
+        from tinyweb_forum import ForumPlugin
+        from db import get_site_name
+        forum = ForumPlugin(DATA_DIR, identity, reticulum, site_name=get_site_name())
+        if get_setting("forum_enabled", "0") == "1":
+            forum.enable()
+            templates_mod.FORUM_ENABLED = True
+        handlers_mod.forum_plugin = forum
+        print(f"Forum plugin: {'enabled' if forum.is_enabled() else 'available (enable in settings)'}")
+    except ImportError:
+        print("Forum plugin not installed (pip install tinyweb[forum])")
+    except Exception as e:
+        print(f"Forum plugin error: {e}")
+
     # Brief delay to ensure all interfaces (especially TCP) are fully ready
     time.sleep(2)
     destination.announce()
diff --git a/handlers.py b/handlers.py
index e47520b..a3bbb4b 100644
--- a/handlers.py
+++ b/handlers.py
@@ -6,9 +6,11 @@ from datetime import datetime
 from urllib.parse import unquote
 
 from db import get_db, return_db, get_setting, set_setting, get_site_name, index_url, clean_url
+import templates as templates_mod
 from templates import esc, wrap_page, DEFAULT_TEMPLATE
 from rns_client import fetch_remote_sites
 
+forum_plugin = None
 _request_local = threading.local()
 
 
@@ -360,7 +362,7 @@ def handle_search(query):
     )
 
 
-def handle_add_form(msg="", action_type="index"):
+def handle_add_form(msg="", action_type="index", prefill_url=""):
     if action_type == "subscribe":
         return _respond(
             f"<h1>subscribe</h1>"
@@ -374,12 +376,13 @@ def handle_add_form(msg="", action_type="index"):
             f"<p>{msg}</p>"
             f'<a href="/">back</a>'
         )
+    url_value = f'value="{esc(prefill_url)}" ' if prefill_url else ""
     return _respond(
         f"<h1>add url</h1>"
         f"<p>Add a site to your index</p>"
         f'<form method="post" action="/add">'
         f'{_csrf_field()}'
-        f'<input name="url" placeholder="https://example.com" size="50"><br><br>'
+        f'<input name="url" placeholder="https://example.com" size="50" {url_value}><br><br>'
         f'<input name="note" placeholder="why are you saving this? (optional)" size="50"><br><br>'
         f'<input name="tags" placeholder="tags (comma-separated, e.g. solarpunk, mesh)" size="50"><br>'
         f'<small>tag: private to exclude from sharing</small><br><br>'
@@ -814,6 +817,8 @@ def handle_style_form(msg=""):
     sharing = get_setting("sharing_enabled", "0")
     checked = " checked" if sharing == "1" else ""
     sharing_mode = get_setting("sharing_mode", "exclude_private")
+    forum = get_setting("forum_enabled", "0")
+    forum_checked = " checked" if forum == "1" else ""
     exclude_checked = " checked" if sharing_mode != "require_public" else ""
     require_checked = " checked" if sharing_mode == "require_public" else ""
     shared_count = _count_shared_pages()
@@ -840,6 +845,17 @@ def handle_style_form(msg=""):
     lora_txpower = get_setting("lora_txpower", "7")
     lora_sf = get_setting("lora_sf", "8")
     lora_cr = get_setting("lora_cr", "5")
+    if forum_plugin is not None:
+        forum_section = (
+            f"<h2>forum</h2>"
+            f'<label><input type="checkbox" name="forum_enabled" value="1"{forum_checked}>'
+            f" enable forum (shared URL discussion board)</label><br>"
+            f"<small>Share URLs and discuss them with other TinyWeb instances. "
+            f"Requires <code>tinyweb-forum</code> — "
+            f'<a href="https://git.derickphan.com/lichenblankie/tinyweb-forum">more info</a>.</small><br><br>'
+        )
+    else:
+        forum_section = ""
     return _respond(
         f"<h1>customize</h1>"
         f"<h2>name your search engine</h2>"
@@ -915,6 +931,7 @@ def handle_style_form(msg=""):
         f"<small>Saves ~50% on storage for embeddings. Slight quality reduction at large scale.</small><br><br>"
         f'<a href="/reindex">manage semantic index</a><br><br>'
         f"</div>"
+        {forum_section}
         f"<h2>custom html</h2>"
         f"<p>Edit the full page template. Use <code>{esc('{{content}}')}</code> "
         f"where page content should appear.</p>"
@@ -974,6 +991,27 @@ def handle_style_submit(body):
     set_setting("lora_txpower", body.get("lora_txpower", ["7"])[0].strip())
     set_setting("lora_sf", body.get("lora_sf", ["8"])[0].strip())
     set_setting("lora_cr", body.get("lora_cr", ["5"])[0].strip())
+    forum_enabled = "1" if body.get("forum_enabled") else "0"
+    current_forum = get_setting("forum_enabled", "0")
+    if forum_enabled != current_forum:
+        if forum_enabled == "1" and forum_plugin is None:
+            return handle_style_form(
+                "Forum plugin not installed. Run: pip install tinyweb-forum"
+            )
+        if forum_enabled == "1":
+            forum_plugin.enable()
+            try:
+                forum_plugin.fdb.set_setting("forum_enabled", "1")
+            except Exception:
+                pass
+        else:
+            forum_plugin.disable()
+            try:
+                forum_plugin.fdb.set_setting("forum_enabled", "0")
+            except Exception:
+                pass
+        set_setting("forum_enabled", forum_enabled)
+        templates_mod.FORUM_ENABLED = (forum_enabled == "1")
     return handle_style_form("Saved. Restart TinyWeb for mesh network changes to take effect.")
 
 
@@ -1654,7 +1692,11 @@ def _dispatch_inner(data):
             return handle_search(query)
         elif path == "/add":
             action_type = query.get("type", ["index"])[0]
-            return handle_add_form(action_type=action_type if action_type == "subscribe" else "index")
+            prefill_url = query.get("url", [""])[0].strip()
+            return handle_add_form(
+                action_type=action_type if action_type == "subscribe" else "index",
+                prefill_url=prefill_url,
+            )
         elif path == "/pages":
             return handle_pages(query)
         elif path.startswith("/edit/"):
@@ -1689,7 +1731,15 @@ def _dispatch_inner(data):
         elif path.startswith("/subscriptions/browse/"):
             sid = extract_id("/subscriptions/browse/")
             return handle_subscription_browse(sid) if sid is not None else _error(400)
+        elif path.startswith("/forum"):
+            if forum_plugin and forum_plugin.is_enabled():
+                return forum_plugin.handle(method, path, query, {}, data.get("cookies", {}))
+            return _error(404)
     elif method == "POST":
+        if path.startswith("/forum"):
+            if forum_plugin and forum_plugin.is_enabled():
+                return forum_plugin.handle(method, path, query, body, data.get("cookies", {}))
+            return _error(404)
         if not _check_csrf(body):
             return _respond("<h1>403 Forbidden</h1><p>Invalid or missing CSRF token.</p>", status=403)
         if path == "/add":
@@ -1737,7 +1787,28 @@ def _dispatch_inner(data):
 
 
 def dispatch_request(data):
+    path = data.get("path", "/")
     cookies = data.get("cookies", {})
+
+    # Forum handles its own CSRF — skip main CSRF to avoid cookie conflicts
+    if path.startswith("/forum") and forum_plugin and forum_plugin.is_enabled():
+        resp = _dispatch_inner(data)
+        resp.setdefault("headers", {})
+        resp["headers"]["X-Frame-Options"] = "DENY"
+        resp["headers"]["X-Content-Type-Options"] = "nosniff"
+        if resp.get("content_type", "").startswith("text/html"):
+            resp["body"] = wrap_page(resp.get("body", ""))
+            resp["headers"]["Content-Security-Policy"] = (
+                "default-src 'self'; "
+                "script-src 'self' 'unsafe-inline'; "
+                "style-src 'self' 'unsafe-inline'; "
+                "img-src * data:; "
+                "frame-ancestors 'none'; "
+                "form-action 'self'; "
+                "base-uri 'self'"
+            )
+        return resp
+
     csrf_token = cookies.get("_csrf", "")
     if not csrf_token:
         csrf_token = secrets.token_hex(32)
diff --git a/requirements.txt b/requirements.txt
index 121fd1f..29da454 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+# forum: pip install tinyweb-forum (optional, adds URL discussion board)
 requests
 beautifulsoup4
 rns
diff --git a/templates.py b/templates.py
index 0dd9975..651e08c 100644
--- a/templates.py
+++ b/templates.py
@@ -1,22 +1,24 @@
 import html
 from db import get_setting
 
+FORUM_ENABLED = False
 
 def esc(s):
     return html.escape(str(s))
 
 
-
 DEFAULT_TEMPLATE = "<html>\n<head>\n<meta name=\"referrer\" content=\"no-referrer\">\n<meta http-equiv=\"x-dns-prefetch-control\" content=\"off\">\n</head>\n<body>\n{{content}}\n</body>\n</html>"
 
 
 def _default_template():
     name = esc(get_setting("site_name", "tinyweb"))
+    forum_link = ' | <a href="/forum">forum</a>' if FORUM_ENABLED else ""
     return (
         '<html>\n<head>\n<meta name="referrer" content="no-referrer">\n<meta http-equiv="x-dns-prefetch-control" content="off">\n</head>\n<body>\n'
         f'<p><b><a href="/">{name}</a></b>'
         ' | <a href="/">search</a> | <a href="/pages">browse</a>'
         ' | <a href="/tags">tags</a> | <a href="/subscriptions">subscriptions</a>'
+        f'{forum_link}'
         ' | <a href="/style">customize</a> | <a href="/about">about</a></p>\n'
         "<hr>\n{{content}}\n</body>\n</html>"
     )