Skype today released Skype 5.4 for Mac beta. The new version gives Mac users the same Facebook integration found in Skype 5.5 for Windows. If you're on a Mac, you can download the beta from skype.com/go/download-beta.
Just like you can on the Windows client, if you're a Mac user, you can now instant message your friends using Facebook Chat without leaving Skype. You will also be able to use Skype for Mac to read and update your News Feed, as well as comment and Like your Facebook friends' posts.
To connect your Facebook account to Skype, sign in to the Skype client, click on the Connect to Facebook tab, and log in to Facebook. Unfortunately, Skype is also adding an advertising platform in this release, so unless you're a paying Skype customer or have Skype Credit, you'll be seeing display ads just like on the Skype for Windows client.
Skype 5.5 for Windows with deeper Facebook integration was released two months ago. Skype has not provided a release date for when the new Mac version will come out of beta.