I've been googling around forever now and I can't seem to figure it out.
So, I noticed that with many wordpress blogs when I hit the Facebook "share" button, a pop-up window opens displaying a small photo (you can even choose one out of 4 or so) and a small excerpt of the blog post.

For my blog, however, it only displays the link / url and not excerpt or photo.

I have absolutely no clue what those other blogs do differently.

I hope my description of the problem was clear enough.

P.S.: I used the following code:

    <a type="buttoncount" name="fb_share" href="http://www.facebook.com/sharer.php">Share</a>
    <script src="http://static.ak.fbcdn.net/connect.php/js/FB.Share" type="text/javascript"></script>


Thanks a lot in advance for any advice you can give me.