[Plugin: Tweet & Like] in post-list

got the same problem as harzallah and others, i.e. the facebook like link did not work. Solved it by having a look to facebooks original iframe-code on http://developers.facebook.com/docs/reference/plugins/like#.
It shows that the site-url to be liked is missing in the plugin-code.
To fix it search for function “tweetandlike_fb_link” and add href to the first part of the $iframe specification, i.e.:
$iframe = '<iframe src="http://www.facebook.com/plugins/like.php?href='YOURSITEURL';