Great plugin! Thanks for creating.
I was wondering if it would be possible to integrate into the sidebar with Varnish cache whilst using ESI? - Thus to correctly rotate ad on every page whilst maintaining page cache on other elements of the site.
I've found a pretty helpful guide but not sure exactly how to go about doing this: http://timbroder.com/2012/12/getting-started-with-varnish-edge-side-includes-and-wordpress.html
Any help would be greatly appreciated.