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As some of the most visual social channels, Instagram, Snapchat, and Pinterest have become important tools for brand marketers. These are also the channels most likely to be used by so-called “influencers,” the social media stars who frequently partner with brands to promote products to their online followers. Influencer marketing has become a big business, with 31% of retailers now working with brand advocates to become influencers and 28% using paid celebrity influencers to spread the word about their products and services.

Here are six popular influencer marketing platforms being used by retailers and brands right now.