With the rise in social media advertisements, this is a neat little tool to reference!
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Instagram Banner Templates - 12 Designs - Banners & Ads Web Template PSD. Download here: http://graphicriver.net/item/instagram-banner-templates-12-designs/10813905?s_rank=1770&ref=yinkira
Awesome cover photo for FB & insta.
Win a Trip-->Contest Display Ad Campaign Travel banners Template PSD
Photography Facebook Timeline Cover Template PSD. Download here: http://graphicriver.net/item/photography-facebook-timeline-cover/16526857?ref=ksioks
I found this link to be useful as it shows a large variety of ads featuring slight variations of one incredible design.