all: add <meta> tags for social media cards

This should make sharing on Twitter and in chat apps show nice
little cards for links that are shared. We can revise as needed
once we get some experience seeing them live.

Change-Id: I2fb41afd90193042c881868fe592bd2294208c90
Run-TryBot: Russ Cox <>
TryBot-Result: Gopher Robot <>
Reviewed-by: Jamal Carvalho <>
diff --git a/_content/doc/gopher/gopher5logo.jpg b/_content/doc/gopher/gopher5logo.jpg
new file mode 100644
index 0000000..80c8b6f
--- /dev/null
+++ b/_content/doc/gopher/gopher5logo.jpg
Binary files differ
diff --git a/_content/doc/gopher/gopherbelly300.jpg b/_content/doc/gopher/gopherbelly300.jpg
new file mode 100644
index 0000000..4c8a393
--- /dev/null
+++ b/_content/doc/gopher/gopherbelly300.jpg
Binary files differ
diff --git a/_content/doc/gopher/pencil/gophermegasquare.jpg b/_content/doc/gopher/pencil/gophermegasquare.jpg
new file mode 100644
index 0000000..bc481fe
--- /dev/null
+++ b/_content/doc/gopher/pencil/gophermegasquare.jpg
Binary files differ
diff --git a/_content/site.tmpl b/_content/site.tmpl
index bc9ac60..c2e8a1d 100644
--- a/_content/site.tmpl
+++ b/_content/site.tmpl
@@ -27,7 +27,14 @@
   <!-- End Google Tag Manager -->
 <script src="/js/site.js"></script>
+<meta name="og:url" content="{{.URL}}">
+<meta name="og:title" content="{{.title}}{{if ne .URL "/"}} - The Go Programming Language{{end}}">
 <title>{{.title}}{{if ne .URL "/"}} - The Go Programming Language{{end}}</title>
+{{if .summary}}<meta name="og:description" content="{{.summary}}">{{end}}
+<meta name="og:image" content="">
+<meta name="twitter:image" content="">
+<meta name="twitter:card" content="summary">
+<meta name="twitter:site" content="@golang">
 {{if .link -}}
 <meta http-equiv="refresh" content="0; url={{.link}}">
 {{end -}}