Question on Upvoice participating sites

Users of Upvoice? When I read through their FAQ, it tells me the participating sites I would need to visit for compensation. But I don't see any clarification on whether you need to use all the sites or at least just one of them.

submitted by /u/LadySueLou
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source https://www.reddit.com/r/beermoney/comments/f5sez9/question_on_upvoice_participating_sites/