NationBuilder has phased out connecting Facebook and X (aka Twitter) to broadcasters.
To add Facebook, X/Twitter, Instagram, YouTube, LinkedIn, Flickr, or other social media accounts, follow these instructions.
Add Your Social Media Buttons Anywhere on a Page
[ social-buttons ]
Add Social Share Buttons to Your Pages
Add the following tag to any page to add social share buttons at the bottom of the page. If you add this to a blog page, all blog posts under that page will also display social share buttons.
layout_share