Add like/recommend button, also send button, and optionally use facebook comment instead of wordpress comment for your wordpress site.
RA-Socialize Button adds a Google+, twitter and facebook button to your blog post.
Displays the social widgets from Facebook, Twitter, Google+ and Pinterest with your posts. Also adds some meta tags for opengraph and schema.org.
Create Facebook events automatically when you create WordPress posts. This plugin requires the Simple Facebook Connect plugin by Otto.
It allows to place social sharing links with counters (if available) to the most popular social networks: Menéame,Twitter,Facebook,...
Create a Lifestream on your blog
Add social media buttons to your posts, pages, feeds etc. And track the interaction with the buttons using your Google Analytics account.
A plugin which displays the share buttons (Facebook Like, Tweet and Google plus buttons) on the bottom or on the top of the posts and pages.
Link Spotify tracks to your posts and pages. Including widget.
Wordpress plugin for displaying facebook photo album on wordpress site.
It will add ogg meta tags and perfect thumbnail to your share on Facebook.
This plugin adds Facebook’s Comments Plugin to your blog, instead of natural WordPress Comments Form.
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Customizable jQuery accordion for WordPress which gathers Facebook social plugins together .
RSS link for this tag.