Nevermind, figured it out. If anyone else wants to know:
Go to the plugins page. Click the “Edit” link under Social’s entry. Do a find-in-page search for “social_broadcasting_enabled” which will bring you to this line:
return apply_filters(‘social_broadcasting_enabled_post_types’, array(‘posts’));
And then just change “posts” to whatever the name of your custom post types are. I was also able to add multiple post types to that function as well, such as:
return apply_filters(‘social_broadcasting_enabled_post_types’, array(‘posts’,’news’));
The only difficulty might be finding out what your custom post types are actually named in the code.