Right now, the Google+, Twitter Share, and LinkedIn Share buttons are only available to add automatically to your articles if you're using the Content plugin. In the tab for Likes (either Joomla or K2), there's a new setting there called "Show Twitter/GooglePlus Buttons:", enable that, and you'll get your buttons. You can see what they look like, when configured for box-count, on the 4.0 announcement post below:
www.sourcecoast.com/blog/extensions/jfbc...atures-you-need-this
In a future version, we'll likely be adding these as options for the JFBCLike module/tag, but we wanted to get feedback on the current implementation first.
Let us know how it goes!
Alex