I don't see how this could be possible as facebook gets the URL from the meta data of the page which is always going to be the whole thread, not a single post.
Check that... if you add the code for your like button to the SHOWTHREAD_SHOWPOST template you could like a single post, but only that post would open not the entire thread and you'd have to click on the post number to view the post and like it... this would be the only way.
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