I said Katy having low touring receipts; despite being one of the biggest females, and Rihanna having low album sales; despite being one of the biggest females but both of them having a huge Social Media presence prove it's (Social Media!) a better indicator.
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Sorry for the misunderstanding. It's been a hell of a night. But what does this have to do with Gaga and Xtina (which is what my original comment was about)?