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I don't think there is a minimum amount of followers you should have, but it does look better if you have some followers prior to using the promotions. Honestly, if you have an awesome post that resonates with a lot of people, it won't matter if you have zero followers. I guess more importantly is the quality of your content. Great question!

@brandonfrye doesn't popularity also play big role?

Also, does replying on any comment also count in your daily comment reward?