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Hi, I wouldn't be worried about this too much, the biggest and smallest sites in the world do A/B testing and most of the big ones run it through the back-end of their site. In all cases you're trying to improve the user experience and make sure they have a better time on your site. I don't worry about this for TNW at least.

Thanks for the help here Matt! We've had issues in the past with penalties from unnatural linking networks derived from subdomains, so that will certainly be a focus here. Appreciate it!