In the age of social media, it's important to support social interactions around the content in your fullstack app. Whether it's to 'like' a message with a heart icon, 'fave' a photo with a star, or congratulate a victory announcement with a '🎉' (party popper aka 'tada' emoji), allowing your users to express their opinions graphically in realtime adds to the social appeal of your app. With Convex's built-in primitives for data modeling, querying, and filtering, it's simple to implement an instantly-updating UI for the reaction feature your users need.