Facebook Like Lock for WordPress. Locks your content and user can unlock by clicking on like button.
The Open Graph Protocol enables any web page to become a rich object in a social graph. This plugin renders meta tags within an extension framework.
Inserts Facebook Open Graph, Google+/Schema.org, Twitter and other Meta Tags into your WordPress Website for more efficient sharing results.
The Social Graph Protocol plugin developed by CodeHooks enables you to integrate your websites content into the Facebook Open Graph.
Like Gate allows you to reveal some hidden/secret content when the user likes the article. Therefore increasing the likeness of your articles.
Open Graph Protocol in Posts and Pages (OGP) allows you to add the OG meta tags on a per page basis, or use default settings across the site.
Provides links in your wordpress backend to easily open your page/post in the Facebook Debugger
This plugin adds a Like-Button wherever you want on your blog. Before or after the content as well as a sidebar-widget. And many more!