I'm not sure why we never had this before, but I was checking out my profile today and noticed there was no Facebook setting. So, I went ahead and added one.
If you have a username tied to your Facebook account, you can now add it into your contact details to get it to show with the rest of your social links (under your signature, and in your profile).
If you have a username tied to your Facebook account, you can now add it into your contact details to get it to show with the rest of your social links (under your signature, and in your profile).