--- a/index.html
+++ b/index.html
@@ -6,22 +6,8 @@
 <title>Reversiology · Learn Reversi</title>
 <meta name="description" content="Learn Reversi by playing. An opponent from beginner to superhuman, with a coach that grades and explains every move.">
 <meta name="theme-color" content="#1f7a4d">
-<link rel="canonical" href="https://killedbyapixel.github.io/Reversiology/">
 
 <!-- Social sharing (Open Graph is used by Facebook, Discord, Slack, LinkedIn…; Twitter reads its own tags first) -->
-<meta property="og:type" content="website">
-<meta property="og:site_name" content="Reversiology">
-<meta property="og:title" content="Reversiology · Learn Reversi with a coach that explains every move">
-<meta property="og:description" content="Free, in your browser. Play an opponent that scales from beginner to superhuman, with hints, move grades and plain-language explanations.">
-<meta property="og:url" content="https://killedbyapixel.github.io/Reversiology/">
-<meta property="og:image" content="https://killedbyapixel.github.io/Reversiology/social.jpg">
-<meta property="og:image:width" content="2400">
-<meta property="og:image:height" content="1260">
-<meta property="og:image:alt" content="A Reversi board on a dark table. Reversiology: learn Reversi by playing, with a coach that explains why every move matters.">
-<meta name="twitter:card" content="summary_large_image">
-<meta name="twitter:title" content="Reversiology · Learn Reversi with a coach that explains every move">
-<meta name="twitter:description" content="Free, in your browser. Play an opponent that scales from beginner to superhuman, with hints, move grades and plain-language explanations.">
-<meta name="twitter:image" content="https://killedbyapixel.github.io/Reversiology/social.jpg">
 
 <link rel="icon" type="image/png" sizes="32x32" href="icon-32.png">
 <link rel="icon" type="image/png" sizes="192x192" href="icon-192.png">