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You need to examine a cross section of sites in the same niche/genre as your site. You don't want your thumbs to be substantially larger or smaller than most of the sites you're likely to be trading with. In very general terms, on a trade between two TGP with substially different size thumbs, the site with the larger thumbs will see a higher productivity on incoming traffic, but return traffic to that trade partner will be poor.
My babe/pornstar TGP uses 135x180. I tend to avoid trades with sites that have thumbs larger than 150x200.
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