diff --git a/_includes/head.html b/_includes/head.html
index 014b5e7..f12202c 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -2,12 +2,12 @@
 <title>{% if page.title %}{{ page.title }} &#8211; {% endif %}{{ site.title }}</title>
 <meta name="description" content="{% if page.description %}{{ page.description }}{% else %}{{ site.description }}{% endif %}">
 {% if page.tags %}<meta name="keywords" content="{{ page.tags | join: ', ' }}">{% endif %}
-<!-- Twitter Card and Open Graph tags -->
+{% if site.owner.twitter %}<!-- Twitter Card and Open Graph tags -->
 <meta name="twitter:title" content="{% if page.title %}{{ page.title }} &#8211; {% endif %}{{ site.title }}">
 <meta name="twitter:description" content="{% if page.description %}{{ page.description }}{% else %}{{ site.description }}{% endif %}">
 <meta name="twitter:creator" content="@{{ site.owner.twitter }}">
 <meta name="twitter:card" content="summary">
-<meta name="twitter:image:src" content="{% if page.image.thumb %}{{ site.url }}/images/{{ page.image.thumb }}{% else %}{{ site.url }}/images/{{ site.logo }}{% endif %}">
+<meta name="twitter:image:src" content="{% if page.image.thumb %}{{ site.url }}/images/{{ page.image.thumb }}{% else %}{{ site.url }}/images/{{ site.logo }}{% endif %}">{% end if %}
 <meta property="og:type" content="article">
 <meta property="og:title" content="{% if page.title %}{{ page.title }} &#8211; {% endif %}{{ site.title }}">
 <meta property="og:description" content="{% if page.description %}{{ page.description }}{% else %}{{ site.description }}{% endif %}">