There is this, @Fiona388 : If you click on your photo at the top right of your dashboard and select Profile from the dropdown, you will see Trust and Verification on the left (if working from a laptop). Click that and then scroll down to "Your social accounts". There you have the option to sign in with Facebook "and discover your trusted connections to hosts and guests all over the world".
I have not done this myself, and there are loads of posts in the forum from people having trouble deleting that Facebook sign-in when they don't want it anymore. So be careful. But it's an option if you want it.