chrisglass/cmsplugin_facebook — pull request #4 by richardbarran (2012-08-09 15:23:38+00:00)
Title: Share button deprecated

It seems that the "Share" button on Facebook is being deprecated - I could find no official news on this, but:
* It's no longer listed in the Facebook developer's page (https://developers.facebook.com/docs/plugins/)
* There's several blogs posts warning of this.

Its replacement is the "Like" - so it makes sense to immediately push users of this plugin to always use the "Like" button.