diff --git a/output/js/constants.js b/output/js/constants.js
index 23bc0d1b..49c040a0 100644
--- a/output/js/constants.js
+++ b/output/js/constants.js
@@ -3,6 +3,7 @@
 // change in the foreseeable future.
 
 export const dom = {
+	/** @return {HTMLTableElement | null} */
 	tbl_communities: () => document.getElementById("tbl_communities"),
 	last_checked: () => document.getElementById("last_checked_value"),
 	qr_modal: (communityID) => document.getElementById(`modal_${communityID}`),
diff --git a/output/main.js b/output/main.js
index 24196437..e0b36597 100644
--- a/output/main.js
+++ b/output/main.js
@@ -61,12 +61,26 @@ const transformJoinURL = (join_link) => {
 	});
 }
 
-function onLoad(timestamp) {
-	setLastChecked(timestamp);
+function getTimestamp() {
+	const timestampRaw =
+		document.querySelector('meta[name=timestamp]')
+		?.getAttribute('content');
+	if (!timestampRaw) return null;
+	const timestamp = parseInt(timestampRaw);
+	if (Number.isNaN(timestamp)) return null;
+	return timestamp;
+}
+
+function onLoad() {
+	const timestamp = getTimestamp();
+	if (timestamp !== null) {
+		setLastChecked(timestamp);
+	}
 	hideBadCommunities();
 	sortTable(COLUMN.NAME);
 	createJoinLinkButtons();
 	markSortableColumns();
+	addQRModalHandlers();
 }
 
 function displayQRModal(communityID) {
@@ -77,6 +91,25 @@ function hideQRModal(communityID) {
 	dom.qr_modal(communityID).style.display = "none";
 }
 
+function addQRModalHandlers() {
+	const rows = dom.tbl_communities()?.rows;
+	if (!rows) throw new Error("Rows not found");
+	for (const row of rows) {
+		if (row.querySelector('th')) continue;
+		const communityID = row.getAttribute('--data-identifier');
+		row.querySelector('.td_qr_code').addEventListener(
+			'click',
+			() => displayQRModal(communityID)
+		);
+		const closeButton =
+			dom.qr_modal(communityID).querySelector('.qr-code-modal-close');
+		closeButton.addEventListener(
+			'click',
+			() => hideQRModal(communityID)
+		);
+	}
+}
+
 function createJoinLinkButtons() {
 	const join_URLs = dom.join_urls();
 	Array.from(join_URLs).forEach((td_url) => {
@@ -253,9 +286,13 @@ function markSortableColumns() {
 	const table = dom.tbl_communities();
 	const header_cells = table.querySelectorAll('th');
 	for (let colno = 0; colno < header_cells.length; colno++) {
-	  if (!columnIsSortable(colno)) continue;
+		if (!columnIsSortable(colno)) continue;
 		header_cells[colno].classList.add('sortable');
-	}
+		header_cells[colno].addEventListener(
+			'click',
+			() => sortTable(colno)
+		)
+	};
 }
 
 /**
@@ -279,13 +316,7 @@ function sortTable(column) {
 	setSortState(table, { ascending, column });
 }
 
-// html.js for styling purposes
-window.document.documentElement.classList.add("js");
-
-// Crude way to export from module script due to inline event handlers.
-// Ideally, all handlers would be attached from JS via addEventListener.
-Object.assign(window, {
-	onLoad, sortTable, displayQRModal,
-	hideQRModal, copyToClipboard
-});
+// `html.js` selector for styling purposes
+document.documentElement.classList.add("js");
 
+document.addEventListener('DOMContentLoaded', () => onLoad());
diff --git a/sites/+components/page-head.php b/sites/+components/page-head.php
index 730c42fe..08537b40 100644
--- a/sites/+components/page-head.php
+++ b/sites/+components/page-head.php
@@ -1,3 +1,11 @@
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<link rel="icon" type="image/svg+xml" href="favicon.svg" sizes="any">
\ No newline at end of file
+<link rel="icon" type="image/svg+xml" href="favicon.svg" sizes="any">
+<meta name="keywords" content="Session, Community, Anonymous, Chat">
+<meta 
+    http-equiv="Content-Security-Policy" 
+    content="
+        script-src 'self'; img-src 'self' data:; connect-src 'self'; font-src 'none';
+        object-src 'none'; media-src 'none'; form-action 'none'; base-uri 'self';
+    "
+>
diff --git a/sites/+components/qr_modals.php b/sites/+components/qr_modals.php
index adf6e2d8..1a4f31cb 100644
--- a/sites/+components/qr_modals.php
+++ b/sites/+components/qr_modals.php
@@ -34,7 +34,7 @@
 <?php foreach ($rooms as $id => $room): ?>
 	<div id="modal_<?=$id?>" class="qr-code-modal">
 		<div class="qr-code-modal-content">
-			<span class="qr-code-modal-close" onclick='hideQRModal("<?=$id?>")'>
+			<span class="qr-code-modal-close">
 				&times;
 			</span>
 			<img
diff --git a/sites/+components/tbl_communities.php b/sites/+components/tbl_communities.php
index cc589d14..a9dfd40b 100644
--- a/sites/+components/tbl_communities.php
+++ b/sites/+components/tbl_communities.php
@@ -6,14 +6,15 @@
 		// Join URL contents are not guaranteed to have visible text.
 		return $id != "qr" && $id != "preview" && $id != "join_url";
 	}
-	
+
 	function sort_onclick($colno) {
 		global $TABLE_COLUMNS;
 		$column = $TABLE_COLUMNS[$colno];
 		if (!column_sortable($column['id'])) return "";
-		return " onclick='sortTable($colno)' title='Click to sort this column'";
+		$name = $column['name'];
+		return " title='Click to sort by $name'";
 	}
-	
+
 	$TABLE_COLUMNS = [
 		['id' => "identifier", 'name' => "Identifier"],
 		['id' => "language", 'name' => "L"],
@@ -51,17 +52,29 @@
 
 		$hostname = explode("//", $room->join_link)[1];
 		$hostname = explode("/", $hostname)[0];
+
+		// Escape external input.
+		// Ternaries prevent passing null-equal strings, which produce warnings.
+		$id = htmlspecialchars($id);
+		$language = $room->language ? htmlspecialchars($room->language) : "";
+		$name = htmlspecialchars($room->name);
+		$desc = $room->description ? htmlspecialchars($room->description) : "";
+		$users = htmlspecialchars($room->active_users);
+		$preview_link = htmlspecialchars($room->preview_link);
+		$join_link = htmlspecialchars($room->join_link);
+		// TODO: Do not forget to rename this escape when merging!
+		$token = htmlspecialchars($token);
+		$hostname = htmlspecialchars($hostname);
 	?>
 
-	<tr id="<?=$id?>">
-		<td class="td_identifier"><?=$id?></td>
-		<td class="td_language"><?=$room->language?></td>
-		<td class="td_name"><?=$room->name?></td>
-		<td class="td_description"
-			><?=$room->description?></td>
-		<td class="td_users"><?=$room->active_users?></td>
-		<td class="td_preview">
-			<a href="<?=$room->preview_link?>" target="_blank" rel="noopener noreferrer">
+	<tr id="<?=$id?>" itemscope itemtype="https://schema.org/EntryPoint" --data-identifier="<?=$id?>">
+		<td class="td_identifier" itemprop="identifier"><?=$id?></td>
+		<td class="td_language"><?=$language?></td>
+		<td class="td_name" itemprop="name"><?=$name?></td>
+		<td class="td_description" itemprop="description"><?=$desc?></td>
+		<td class="td_users"><?=$users?></td>
+		<td class="td_preview" itemprop="url">
+			<a href="<?=$preview_link?>" target="_blank" rel="noopener noreferrer nofollow">
 				<?php if (str_starts_with($room->preview_link, 'http://')): ?>
 					<span class="protocol-indicator protocol-http">HTTP</span>
 				<?php endif; ?>
@@ -71,26 +84,26 @@
 			</a>
 		</td>
 		<td class="td_qr_code">
-			<img 
-				class="qr-code-icon" 
+			<img
+				class="qr-code-icon"
 				src="qrcode-solid.svg"
-				onclick='displayQRModal("<?=$id?>")'
 				alt="Pictogram of a QR code"
 			>
 		</td>
-		<td class="td_server_icon" 
+		<td class="td_server_icon"
 			data-token="<?=$token?>"
 			title="<?=$hostname?> (<?=$token?>)"
+			item="image"
 		>
 			<div class="td_server_icon-circle" style="background-color: <?=$icon_color?>">
 				<span><?=strtoupper($token[0] . $token[1])?></span>
 			</div>
 		</td>
 		<td class="td_join_url">
-			<div class="join_url_container" data-url="<?=$room->join_link?>">
-				<a class="join_url show-from-w5" title="<?=$room->join_link?>"
-					><?=truncate($room->join_link, 32)?></a>
-				<a class="noscript" href="<?=$room->join_link?>"
+			<div class="join_url_container" data-url="<?=$join_link?>">
+				<a class="join_url show-from-w5" title="<?=$join_link?>"
+					><?=truncate($join_link, 32)?></a>
+				<a class="noscript" href="<?=$join_link?>" rel="external nofollow"
 					>Copy link</a>
 			</div>
 		</td>
diff --git a/sites/index.php b/sites/index.php
index 8d51d44b..ecc21bb1 100644
--- a/sites/index.php
+++ b/sites/index.php
@@ -13,17 +13,35 @@
 	<head>
 		<?php include "+components/page-head.php" ?>
 
+		<link rel="canonical" href="https://sessioncommunities.online/">
 		<link rel="stylesheet" href="styles2.css">
-		<script type="module" src="main.js"></script>
+		<script type="module" src="./main.js"></script>
 		<title>Self-updating list of active Session communities</title>
+		<meta name="description" content="
+			Directory of Session Open Groups — public chatrooms within Session Messenger.
+			Copy these Communities into the Session app
+			and talk anonymously about Privacy, Security, or Cryptocurrency.
+		">
+		<meta name="modified" content="<?=date("Y-m-d H:i:s", $timestamp)?>">
+		<meta property="og:title" content="Click here for Session Communities">
+		<meta
+			property="og:description"
+			content="<?=count($rooms_assoc)?> Communities and counting — updated every day!"
+		>
+		<meta property="og:url" content="https://sessioncommunities.online/">
+		<meta property="og:type" content="website">
+		<meta property="og:locale" content="en_US"/>
+		<meta name="timestamp" content="<?=$timestamp?>">
 	</head>
-	<body onload="onLoad(<?php echo $timestamp ?>)">
+	<body>
 		<header>
 			<div id="header-start"></div>
 			<div id="header-end">
 				<a
 					id="link-instructions"
 					target="_blank"
+					rel="help"
+					title="Mutli-language guide to joining communities using the site."
 					href="instructions.html"
 				>Instructions</a>
 			</div>
@@ -50,10 +68,16 @@
 			</p>
 			<p id="disclaimer">
 					This site is not affiliated with
-					<a href="https://optf.ngo">Oxen Privacy Tech Foundation</a>.
+					<a
+						href="https://optf.ngo"
+						target="_blank"
+					>Oxen Privacy Tech Foundation</a>.
 					<br>
 					Communities shown are fetched automatically from
-					various sources.
+					<a
+						href="https://github.com/mdPlusPlus/sessioncommunities.online#which-sources-are-crawled"
+						target="_blank"
+					>various sources</a>.
 					<br>
 					We make an attempt to hide communities containing
 					objectionable or illegal content, but
@@ -65,8 +89,13 @@
 				only available with JS enabled.
 			</p>
 			<p>
-				<label for="toggle-show-room-ids" class="clickable anchorstyle">
-					Toggle room identifier display
+				<label
+					for="toggle-show-room-ids"
+					class="clickable anchorstyle"
+					tabindex="0"
+					title="Shows a column with community identifiers
+					for developers or language data contributors.">
+						Toggle room identifier display
 				</label>
 			</p>
 			<nav>
@@ -83,17 +112,30 @@
 				<a
 					href="https://github.com/oxen-io/session-pysogs"
 					target="_blank"
-					title="Information about running a community server"
+					title="Information about running a community server."
 				>Host Your Own Community</a>
 				<a
 					href="https://getsession.org/terms-of-service"
 					target="_blank"
 				>Session Terms Of Service</a>
+			</nav>
+			<nav>
 				<a
 					href="https://github.com/mdPlusPlus/sessioncommunities.online"
 					target="_blank"
 					title="sessioncommunities.online repository on GitHub."
-				>Source Code & Contact</a>
+				>Source Code</a>
+				<a
+					href="https://lokilocker.com/someguy/sessioncommunities.online"
+					target="_blank"
+					title="sessioncommunities.online repository on Lokinet Gitea."
+				>Source Code (Mirror)</a>
+				<a
+					href="https://github.com/mdPlusPlus/sessioncommunities.online#contact"
+					target="_blank"
+					rel="author"
+					title="Information on how to contact the maintainer of sessioncommunities.online"
+				>Contact</a>
 			</nav>
 		</footer>
 		<div id="copy-snackbar">
diff --git a/sites/instructions.php b/sites/instructions.php
index a89723e4..fb4275dd 100644
--- a/sites/instructions.php
+++ b/sites/instructions.php
@@ -1,46 +1,66 @@
 <?php
 	include_once "+getenv.php";
 	$instruction_files = glob("+instructions/*.txt");
+	function file_language($file) { return pathinfo($file)['filename']; }
 ?>
 <!DOCTYPE html>
 <html>
 	<head>
 		<?php include "+components/page-head.php" ?>
 
+		<link rel="canonical" href="https://sessioncommunities.online/instructions.php">
 		<link rel="stylesheet" href="css/instructions.css">
 		<style type="text/css">
 		<?php foreach ($instruction_files as $i => $file): ?>
-			#language-selection-<?=$i?>:checked ~ 
+			#language-selection-<?=$i?>:checked ~
 			#instructions #instructions-<?=$i?> {
 				display: block;
 			}
 		<?php endforeach; ?>
 		</style>
+		<meta name="description" content="
+			Discover how to use the sessioncommunities.online website
+			to help you join Session Open Groups; available in <?php
+			// Print languages instructions are available in.
+			$languages = array_map('file_language', array_slice($instruction_files, 0, 10));
+			echo(join(", ", $languages));
+			?>. In short: Use the Copy button or scan the QR code!
+		">
+		<meta property="og:title" content="How to join Session Communities">
+		<meta property="og:description" content="Learn how to use sessioncommunities.online to join">
+		<meta property="og:url" content="https://sessioncommunities.online/instructions.php">
+		<meta property="og:type" content="article">
 	</head>
 	<body>
 		<header>
 			<h1>Instructions for joining Session Communities</h1>
 		</header>
 		<main>
+			<p>
+				<a href="/" title="Return to the Session Community listing">
+					Go back to Community list
+				</a>
+			</p>
 			Choose your language:
 			<?php foreach ($instruction_files as $i => $file): ?>
 			<br>
-			<input 
+			<input
 				id="language-selection-<?=$i?>"
 				class="language-selection"
 				name="language"
 				type="radio"
+				<?=file_language($file) == 'English' ? 'checked="checked"' : ''?>
 			>
 			<label for="language-selection-<?=$i?>">
 				<?=
 					// Name of the language
 					// Can be later parsed from i.e. first line of file
-					pathinfo($file)['filename']
+					file_language($file);
 				?>
 			</label>
 			<?php endforeach; ?>
-			
-			
+
+
 			<article id="instructions">
 			<?php foreach ($instruction_files as $i => $file): ?>
 			<section id="instructions-<?=$i?>" class="instructions"><?php