: For security, Facebook sends an alert to your Gmail if someone tries to log in from an unrecognized device. 3. Linking Accounts for One-Tap Login

: When setting up the link, Facebook sends a confirmation email to the Gmail address to ensure it belongs to you. 2. Facebook Activity in Your Inbox

You can use any Gmail address to create or manage a Facebook account. This is a common setup that allows you to: Sign In Directly

If your account is "open" in the sense that you are constantly seeing it in Gmail, you are likely receiving Notifications Login Alerts Social Tab

: Gmail often filters Facebook emails into the "Social" tab, where you can see friend requests, tags, and messages. Login Alerts

: Enter your full Gmail address and your Facebook-specific password on the Facebook Login Page Recover Your Account