https://apple.gadgethacks.com/how-to/use-facetimes-secret-hand-gestures-and-reaction-buttons-add-animated-screen-effects-your-video-feed-0385445/
Use FaceTime's Secret Hand Gestures and Reaction Buttons to Add Animated On-Screen Effects to...
Apple's Messages app has long had visual effects you could apply manually after long-pressing the send button, and there are even hidden keywords you could...
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How to Use FaceTime on the iPad
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