Social Buttons with studiointeract/accounts-ui?

I’m using studiointeract/accounts-ui with Mantra/React. So far it is a great experience. At this point I’m trying to figure out how to get the social buttons for login via Facebook, Twitter, etc. to appear on the login page.

I’ve run meteor add accounts-facebook to see if that would be enough to get an initial Facebook login button to appear on the login page, but it does not yet appear.

How do you get these social login buttons to appear on the login page when using studiointeract/accounts-ui?