to add a meta image just add the following to _header.html in your template
<link rel="image_src" href="http://mysite.com/image.png />
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<link rel="image_src" href="http://mysite.com/image.png" />
Now the image appears when i share my site's link in fb.
But how can we do it for every photos and videos??
ALERT: when I cleared cashe my site broke
I removed my pre-made header due this.