https://techcrunch.com/2023/05/02/meta-rolls-out-new-discovery-and-personalization-controls-for-facebook-reels/

Meta CEO Mark Zuckerberg announced today that the company is introducing new features that make it easier for users to discover and personalize Facebook Reels recommendations. The company is launching new personalization controls for Reels that let users customize what they want to see more or less of.

Now when you see a Reel, you can tap the three-dot menu at the bottom of the video player and select either “Show More” or “Show Less.” Users will start to see this option at the bottom of Reels as well as videos in the Watch feed. If you select the “Show More” option on a Reel, Facebook will temporarily increase its ranking score and for Reels like it. Selecting the “Show Less” option will temporarily decrease its ranking score. Facebook previously rolled out the Show More and Show Less buttons to regular posts on the social network.