Yesterday, +Yoast released ver. 2.1 of his plugin and there are some big updates, including the new Google mobile breadcrumbs instead of permalinks, and changes to Twitter and Facebook in the Social section.
See the video tour below for a quick view of the new features.
FYI, you only need a Facebook App ID if you use a Facebook App on your site, such as a special Like button, or other type of integration that requires you to verify your site with Facebook.
And look for updates to at least 2 of the 7 new videos on every setting for this plugin that you can find in both the WordPress | SEO | Genesis video library as well as the Webmaster Training video library soon too.
And, you can see all the new features in the last major release of 2.0 too.