http://www.popundertraffic.netPop under exchange offering 2:1 ratio, option to buy hits.Advertising, Banners, and Exchanges > Pay for Traffica free service designed to help web sites trade advertising with each other.
The mechanism of advertising is a pop-behind(or pop-under) window that loads
a web page behind the page you are currently surfing. This form of advertising
is much less annoying than a pop-up or exit window, and has much
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