Hi @jq1805 like @-Robot- I am not aware of a Finger print login for Facebook/Instagram. I have checked the settings, you can use two factor authentication when logins are detected from unknown Devices.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .
You can move these apps to your Secure Folder though. You would then need to insert a password/fingerprint/pattern to access the folder, and then your Facebook app.
Check out this guide for more help: https://www.samsung.com/uk/support/mobile-devices/what-do-the-different-indicator-icons-mean-on-your...
Welcome to the Community!
Yes with Samsung pass
You can find it in Settings>Biometrics & Security