Sign into gmail through facebook

Unfortunately, it's not possible to sign into Gmail directly through Facebook. Gmail is a Google service, and Facebook is a separate platform. They are two different companies with their own authentication systems.

However, you can use Facebook to sign into other Google services, such as Google Drive, Google Photos, or Google Play, using the "Sign in with Google" option. This option allows you to use your Facebook credentials to authenticate with Google services.

Here's how to do it:

1. Go to the Google service you want to sign into (e.g., Google Drive, Google Photos, etc.).
2. Click on the "Sign in" button.
3. Click on the "Sign in with Google" option.
4. You will be redirected to the Facebook login page.
5. Enter your Facebook login credentials (email and password).
6. If your Facebook credentials are valid, you will be redirected back to the Google service, and you will be signed in.

Note that this method only works for Google services that support "Sign in with Google" and not for Gmail specifically. To sign into Gmail, you need to use your Google account credentials (email and password).