diff --git a/config/_default/params.toml b/config/_default/params.toml
index 0803aea5..d8e097ea 100644
--- a/config/_default/params.toml
+++ b/config/_default/params.toml
@@ -23,6 +23,7 @@ disableTextInHeader = false
# defaultBackgroundImage = "IMAGE.jpg" # used as default for background images
# defaultFeaturedImage = "IMAGE.jpg" # used as default for featured images in all articles
+# defaultSocialImage = "/android-chrome-512x512.png" # used as default for social media sharing (Open Graph and Twitter)
# highlightCurrentMenuArea = true
# smartTOC = true
diff --git a/exampleSite/config/_default/params.toml b/exampleSite/config/_default/params.toml
index 8069e6b7..00a1793c 100644
--- a/exampleSite/config/_default/params.toml
+++ b/exampleSite/config/_default/params.toml
@@ -23,6 +23,7 @@ disableTextInHeader = false
defaultBackgroundImage = "/img/background.svg"
defaultFeaturedImage = "/img/featured.svg"
+defaultSocialImage = "/img/blowfish.jpg"
highlightCurrentMenuArea = true
smartTOC = true
diff --git a/exampleSite/content/docs/configuration/index.it.md b/exampleSite/content/docs/configuration/index.it.md
index 4da3babd..f88e3683 100644
--- a/exampleSite/content/docs/configuration/index.it.md
+++ b/exampleSite/content/docs/configuration/index.it.md
@@ -181,6 +181,7 @@ Many of the article defaults here can be overridden on a per article basis by sp
| `disableTextInHeader` | `false` | Disables text in header, useful for logo based headers. |
| `defaultBackgroundImage` | _Not set_ | Default background image for both `background` homepage layout and `background` hero style |
| `defaultFeaturedImage` | _Not set_ | Default background image for all `featured` images across articles, will be overridden by a local `featured` image. |
+| `defaultSocialImage` | _Not set_ | Default image for social media sharing (Open Graph and Twitter). Will be overridden by a local `feature` image if available. |
| `highlightCurrentMenuArea` | _Not set_ | Marks menu entries in the main menu when selected |
| `smartTOC` | _Not set_ | Activate smart Table of Contents, items in view will be highlighted. |
| `smartTOCHideUnfocusedChildren` | _Not set_ | When smart Table of Contents is turned on, this will hide deeper levels of the table when they are not in focus. |
diff --git a/exampleSite/content/docs/configuration/index.ja.md b/exampleSite/content/docs/configuration/index.ja.md
index 0630f6f4..24f36382 100644
--- a/exampleSite/content/docs/configuration/index.ja.md
+++ b/exampleSite/content/docs/configuration/index.ja.md
@@ -181,6 +181,7 @@ Blowfish は、テーマの機能を制御する多数の設定パラメータ
| `disableTextInHeader` | `false` | ヘッダーのテキストを無効にします。ロゴベースのヘッダーに役立ちます。 |
| `defaultBackgroundImage` | _未設定_ | `background` ホームページレイアウトと `background` ヒーロースタイルの両方のデフォルトの背景画像です。 |
| `defaultFeaturedImage` | _未設定_ | 記事全体のすべての `featured` 画像のデフォルトの背景画像です。ローカルの `featured` 画像によってオーバーライドされます。 |
+| `defaultSocialImage` | _未設定_ | ソーシャルメディア共有（Open Graph と Twitter）用のデフォルト画像。ローカルの `featured` 画像によってオーバーライドされます。 |
| `highlightCurrentMenuArea` | _未設定_ | メインメニューのメニュー項目が選択されているときにマークを付けます。 |
| `smartTOC` | _未設定_ | スマート目次をアクティブにします。表示されている項目が強調表示されます。 |
| `smartTOCHideUnfocusedChildren` | _未設定_ | スマート目次がオンになっている場合、フォーカスされていないときに、テーブルのより深いレベルが非表示になります。 |
diff --git a/exampleSite/content/docs/configuration/index.md b/exampleSite/content/docs/configuration/index.md
index 6cc76234..bf132935 100644
--- a/exampleSite/content/docs/configuration/index.md
+++ b/exampleSite/content/docs/configuration/index.md
@@ -187,6 +187,7 @@ Many of the article defaults here can be overridden on a per article basis by sp
| `disableTextInHeader` | `false` | Disables text in header, useful for logo based headers. |
| `defaultBackgroundImage` | _Not set_ | Default background image for both `background` homepage layout and `background` hero style |
| `defaultFeaturedImage` | _Not set_ | Default background image for all `featured` images across articles, will be overridden by a local `featured` image. |
+| `defaultSocialImage` | _Not set_ | Default image for social media sharing (Open Graph and Twitter). Will be overridden by a local `feature` image. |
| `highlightCurrentMenuArea` | _Not set_ | Marks menu entries in the main menu when selected |
| `smartTOC` | _Not set_ | Activate smart Table of Contents, items in view will be highlighted. |
| `smartTOCHideUnfocusedChildren` | _Not set_ | When smart Table of Contents is turned on, this will hide deeper levels of the table when they are not in focus. |
diff --git a/exampleSite/content/docs/configuration/index.zh-cn.md b/exampleSite/content/docs/configuration/index.zh-cn.md
index 12510ba5..e36f7de5 100644
--- a/exampleSite/content/docs/configuration/index.zh-cn.md
+++ b/exampleSite/content/docs/configuration/index.zh-cn.md
@@ -185,6 +185,7 @@ Blowfish 提供了大量控制主题功能的配置参数，下面的表格中
| `disableTextInHeader` | `false` | 禁用文本类型的标题，对基于 logo 的标题很有用。 |
| `defaultBackgroundImage` | 无 | 设置默认背景图，用于 `background` 和 `hero` 布局下的主页。 |
| `defaultFeaturedImage` | 无 | 设置默认背景图片，用于所有文章的`featured`图片，可以通过文章目录中的 `featured` 图片替换。 |
+| `defaultSocialImage` | 无 | 社交媒体分享（Open Graph 和 Twitter）使用的默认图片，可以通过文章目录中的 `featured` 图片替换。 |
| `highlightCurrentMenuArea` | 无 | 当菜单被选择时，标记主菜单中的菜单项。 |
| `smartTOC` | 无 | 开启智能目录，视图中的项目将会被高亮显示。 |
| `smartTOCHideUnfocusedChildren` | 无 | 当开启智能目录，如果目录级别不再被聚焦时，将会隐藏更深层次的目录。 |
diff --git a/layouts/partials/head.html b/layouts/partials/head.html
index 46f47769..71d8960a 100644
--- a/layouts/partials/head.html
+++ b/layouts/partials/head.html
@@ -107,6 +107,14 @@
{{/* Social */}}
{{ template "_internal/opengraph.html" . }}
{{ template "_internal/twitter_cards.html" . }}
+ {{- /* Main page always uses this; fallback elsewhere if no feature image */ -}}
+ {{- /* See https://gohugo.io/templates/embedded/#open-graph */ -}}
+ {{ if not ($.Resources.GetMatch "*feature*") }}
+ {{ with .Site.Params.defaultSocialImage }}
+
+
+ {{ end }}
+ {{ end }}
{{/* Schema */}}
{{ partial "schema.html" . }}
{{/* Me */}}