Adding external URL to facebook icon

I’m using Visual Composer. Their templete include social links at the bottom with a widget. The code is as follows. I cannot seem to make the link behave. It wants to add my domain in front of the url like so:

Code:

[vc_icon name=”fa-facebook” icon_size=”22px” link=”url:www.facebook.com/groups/72389214561/”]

Result when clicked: http://lifeformingcoach.net/www.facebook.com/groups/72389214561/

My page: http://lifeformingcoach.net/