Something like:
<a class="facebook_icon" href="" target="_blank"></a>
Don't forget that you can always use the FB.ui
method. Just go to the test console, click on examples and choose "feed" under "FB.ui":
var publish = { method: 'feed', message: 'getting educated about Facebook Connect', picture: 'http://fbrell.com/f8.jpg'};FB.ui(publish, Log.info.bind('feed callback'));