User-generated content is typically found on which platform?

User-generated content is primarily associated with social media channels because these platforms encourage users to create, share, and engage with content openly. Social media fosters an interactive environment where users can post their own photos, videos, testimonials, and reviews related to brands or products. This creates a sense of community and authenticity, as consumers often trust content created by their peers over traditional advertisements.

In contrast, email newsletters, brand official websites, and online marketplaces may contain promotional or curated content created by the brand itself or third parties, but they do not typically emphasize user-generated contributions to the same extent as social media platforms. Therefore, social media is the most identifiable space for user-generated content, making it the correct answer.