Twitter Link Preview

<meta name="twitter:card" content=""/>
<meta name="twitter:site" content=""/>
<meta name="twitter:creator" content=""/>
<meta name="twitter:title" content=""/>
<meta name="twitter:description" content=""/>
<meta name="twitter:image" content=""/>

for large card

• twitter:card must be summary_large_image
• twitter:image should be an absolute link (unsure?)