To implement Google Sign-In in a React Native app, you can use packages like react-native-google-signin or @react-native-google-signin/google-signin. First, set up a project in the Google Developer Console, obtain OAuth 2.0 credentials, and configure your app with the generated client ID. Then, install the chosen package, configure it with your credentials, and follow the documentation to integrate Google Sign-In into your app’s authentication flow. We can also implement other social media signing options in React Native like signing with twitter, facebook and instagram etc.