Note: This is not financial advice, and the views expressed in this blog do not represent the views of my firm Sfermion. For those of you not familiar with TikTok or Pinduoduo: TikTok is a short-form video-sharing social networking app. What makes TikTok so powerful is its algorithm. After a few hours on the app, it can tell what type of videos you like based on factors like watch time and engagement.