Facebook Share is one of the most powerful and simple ways for users to share articles, pages, video, or Flash content from your site with their friends on Facebook. Over 1 billion pieces of content are shared each week on Facebook, and many of those are links shared using Facebook Share.
Right now, Facebook Like button is taking over Facebook Share button. Facebook has slowly been rolling out updates to its Like button and has stopped developing the Share Button. Facebook will continue to support the Share button
You still can use Facebook Share button
Box Count – Counter Button on Top
<a name="fb_share" type="box_count" href="http://www.facebook.com/sharer.php" rel="nofollow">Share</a><script type="text/javascript" src="http://static.ak.fbcdn.net/connect.php/js/FB.Share" rel="nofollow"></script>
Button Count – inline with Counter Button
<a name="fb_share" type="button_count" href="http://www.facebook.com/sharer.php" rel="nofollow">Share</a><script type="text/javascript" src="http://static.ak.fbcdn.net/connect.php/js/FB.Share" rel="nofollow"></script>
Link Only
<a name="fb_share" type="icon_link" href="http://www.facebook.com/sharer.php" rel="nofollow">Share</a><script type="text/javascript" src="http://static.ak.fbcdn.net/connect.php/js/FB.Share" rel="nofollow"></script>