Facebook Sharing with angular JS variable replacement - angularjs

I am trying to share my web page and I am using angular js variables in order to pass the meta tag values. For image, I am using it like this:
<meta property="og:image" content="{{imageUrlStr}}">
And for title:
<meta property="og:title" content="{{title}}">
But when I try to share it, facebook share popup displays this like {{title}} and the image is not visible.
When I inspect the statement over Chrome, I can see that all the variables are injected.
Any ideas?
Thx

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