Follow below steps to set up Facebook Login in Magento 2,

Step 1. Create a Facebook app at the Facebook Developer Console.

Step 2. Configure your Facebook Login and obtain your App ID and App Secret.

Step 3. Install a social login extension in Magento 2.

Step 4. Enter the Facebook credentials into the extension settings.

Step 5. Test Facebook login on your site.

You can use our Magento 2 Social Media Login Extension to allow your users to login via social account

Read this guide on How to Add Magento 2 Social Media Logins to Your Store to setup this extension.

Here are the few more resource to help you get most out of this Magento 2 Social Media Login Extension.

• Complete Guide on Advantages of Using Social Media Login
• Simplify Sign Up & Login with Magento 2 Social Media Login Extension
• Best Magento 2 Social Media Extensions for Social Selling & Engagement
• 5 Smart Ways to Generate More Sales from Social Media Platforms
• 12 B2B Social Media Strategies that Work for Any Industry