a.vartoken.com is a quality placement with massive ROI and traffic, however recently it has disappeared.
any idea what is this?
Gotta love similarweb..
At a guess, I'd say they have moved to here: http://www.clickadu.com/
From wherever they were.
That ad network doesn't come up in it's outgoing links in a 6 month range.. but is No1 in last 30 days..
Might not be.. but worth looking at. Hope that helps you.