diff --git a/themes/cosin-theme/layouts/_default/baseof.html b/themes/cosin-theme/layouts/_default/baseof.html
index 71dbc95..63b9307 100644
--- a/themes/cosin-theme/layouts/_default/baseof.html
+++ b/themes/cosin-theme/layouts/_default/baseof.html
@@ -7,6 +7,17 @@
     {{ hugo.Generator }}
 
     <link href='{{ "css/custom.css" | absURL }}' rel="stylesheet" type="text/css" />
+
+    <meta property="og:type" content="website"/>
+    <meta property="og:site_name" content="{{ .Site.Title }}"/>
+    <meta property="og:title" content="{{ .Title }}"/>
+    <meta property="og:url" content="{{ .Permalink | absURL }}"/>
+    <meta property="og:image" content="{{ printf "images/cosin_icon_%s.png" (string .Site.Data.cosin.date_year) | absURL }}"/>
+    <meta property="og:image:type" content="image/png"/>
+    <meta property="og:image:width" content="128"/>
+    <meta property="og:image:height" content="128"/>
+    <meta property="og:image:alt" content="CoSin Icon {{ string .Site.Data.cosin.date_year }}"/>
+
   </head>
 
   <body>
diff --git a/themes/cosin-theme/static/images/cosin_icon_2018.png b/themes/cosin-theme/static/images/cosin_icon_2018.png
new file mode 100644
index 0000000..5675eb9
Binary files /dev/null and b/themes/cosin-theme/static/images/cosin_icon_2018.png differ
diff --git a/themes/cosin-theme/static/images/cosin_icon_2019.png b/themes/cosin-theme/static/images/cosin_icon_2019.png
new file mode 100644
index 0000000..eda1255
Binary files /dev/null and b/themes/cosin-theme/static/images/cosin_icon_2019.png differ
