diff --git a/layouts/partials/header.html b/layouts/partials/header.html
index 8c04f76..035fae6 100644
--- a/layouts/partials/header.html
+++ b/layouts/partials/header.html
@@ -1,17 +1,26 @@
 <!DOCTYPE html>
 <html lang="ja">
-<head>
-  <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1">
-  <meta property="og:title" content="{{ .Title }} | {{ .Site.Title }}" />
+<head prefix="og: http://ogp.me/ns#">
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1" />
+  <meta property="og:title" content="{{ if ne .Url "/" }} {{ .Title }} &middot; {{ end }} {{ .Site.Title }}" />
+  <meta property="og:site_name" content="{{ .Site.Title }}" />
   <meta property="og:url" content="{{ .Permalink }}" />
+  {{ if .IsPage }}
+  <meta property="og:type" content="article" />
+  {{ with .Site.Params.facebook }}
+  <meta property="og:article:author" content="https://facebook.com/{{ . }}" />
+  {{ end }}
+  <meta property="og:article:published_time" content="{{ .Date.Format "2006-01-02T15:04:05Z07:00" | safeHtml }}" />
+  {{ range .Params.tags }}
+  <meta property="og:article:tag" content="{{ . }}" />
+  {{ end }}
+  {{ else }}
+  <meta property="og:type" content="website" />
+  {{ end }}
 
   <title>
-    {{ if eq .Url "/" }}
-    {{ .Site.Title }}
-    {{ else }}
-    {{ .Title }} &middot; {{ .Site.Title }}
-    {{ end }}
+    {{ if ne .Url "/" }} {{ .Title }} &middot; {{ end }} {{ .Site.Title }}
   </title>
 
   <link rel="stylesheet" href="{{ .Site.BaseUrl }}/css/bootstrap.min.css" />
