The Social Plug-Ins are:
- Like Button
- Like Box
- Live Stream
- Activity Feed
Like Box: Below, find the Like Box, which lets the Web visitor Like your Fan Page directly from your site. It has a scrolling area that offers the feed from the Facebook Fan Page and displays photos of many of your website's fans.
Like Button: We are probably most familiar with the Like Button, which we find across the website we visit.
Comments: The Facebook Comments Widget can be found on pages that allow comments, like this blog post on Twitter Influence & Tracking tools
Live Stream: I haven't implemented the Live Stream, which shows status updates. You can find Facebook's description and example here: http://developers.facebook.com/
Friendpile: The Friendpile is displayed within the Like Box; it shows photos of the people that Like your page (became Fans). You can see a standalone description here: http://developers.facebook.com
Activity Feed: An Acitivity Feed example is here: http://developers.facebook.com
Share button: The Share button is powered by the Drupal module named "Share This."
Internationalization: In addition to displaying all these great social widgets, the functionality from the module supports display in the native language of your visitors, given that you already support these languages on your website.