1. Enter the following page:
http://www.facebook.com/facebook-widgets/share.php
2. Select the options you like
3. Copy the code and paste on your own web page
4. On the page that you want to share, add the following lines:
<meta name=”title” content=”Enter the title here” />
<meta name=”description” content=”Enter the description here” />
<link rel=”image_src” href=”http://xxx/preview_image.jpg” />
Facebook would generate the post content based on these tags.
For more information, you may visit:
http://wiki.developers.facebook.com/index.php/Facebook_Share/Specifying_Meta_Tags