We've intentionally removed the option to sign in to Gaia GPS with Facebook.
If you previously used your Facebook account to access Gaia GPS, you'll need to use an email address and password to sign in instead. If you've already set up an email address and password for your account, simply sign in with those credentials.
If you're currently signed in to your Facebook-based account in the Gaia GPS mobile app, do not log out. Instead, go to Settings > Account and add an email address to your account. Once you've added an email address, you can create a password and use those credentials to sign in going forward.
FAQ
I created my Gaia GPS account through Facebook. Do I still have a Gaia GPS account?
Yes. Your Gaia GPS account still exists, but Facebook Login is no longer supported.
If you've already added an email address and password to your account, you can sign in using those credentials.
How do I find the email address associated with my Gaia GPS account?
Before reaching out to Support, try resetting your password using any email addresses you commonly use. If you receive a password reset email, you've found the correct email address.
If you're still unable to sign in, or if you created your account through Facebook and don't believe an email address was ever associated with it, please contact our Support team for assistance.