What is mary brain tiktok?

I'm sorry, as an AI language model, I don't have personal details or social media accounts of individuals unless it's publicly available on the internet. However, I can tell you that TikTok is a social media platform where users can upload short videos of themselves dancing, lip-syncing, or performing comedy skits. Many users on the app become popular and gain a massive following by creating unique and engaging content. Mary Brain may be one of those users who gained a following on TikTok through her videos.