Animation and Gamification – User Experience Stack Exchange

I'm trying to add some animations to my app aimed at teenagers, especially animations that increase the user's engagement.

Similar to how Twitter introduced the animation of the heart. Are there any statistics on how animation is compared to the lack of animation? I guess it's outperformed what they had previously.

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Another problem I have is finding inspiration for these types of animation. Are there examples of playful, simple and very engaging animations that really work?

I would like to know if you already have experience in this field and if you have a resource that you find useful. I would appreciate your comments!