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Nothing beats testing and experimentation. If you were my client, I would advise more of an 85% "hinge head" and 15% "hingehead" split across your product pages. This split aligns with the current search pattern.

Ben, the easiest way to give visitors the "experience" of the Twylah page without endangering your SEO as much would be to link to the page as it's hosted on Twylah's own domain instead of your own. The pages look exactly the same, just the URL of the link and the in address bar would be different. i.e.. www.twylah.com/yourusrname instead of tweets.yourdomain.com Paul