To implement OAuth with Google and Facebook in Node.js, create a project in the Google Cloud Console and enable the Google Sign-In API. For Facebook, create an account on Facebook for Developers and configure API settings. Use libraries like `passport-google-oauth20` and `passport-facebook` to handle authentication, ensure HTTPS encryption, error handling, and sensitive credential storage for security.
Open Graph meta tags control how websites appear on social media platforms like Facebook, Twitter, and LinkedIn, allowing developers to specify title, description, image, and URL for a professional online presence, improved engagement, and increased click-through rates.
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