From Facebook Developer Wiki

Q: How do I include images with the link using this API?

A: It works similar to how fb:share-button works, only you have to include the metadata on the page being referenced in the link. I added this to the article. Thanks for bringing it up!

Pete (563683308 17:35, 27 March 2009 (PDT))

I keep getting "The url you supplied is invalid Error code:1500" error, even with the Example code in this page. Te app is a webiste and the user has perission to Share Items...

Please file a bug and include the URL to your site to help us investigate. Thanks, Pete (563683308 11:05, 4 May 2009 (PDT))

I, too am getting "Uncaught exception 'FacebookRestClientException' with message 'The url you supplied is invalid'" - a bunch of mumbojumbo, then points to the client package: "{main} thrown in /home/content/l/i/k/likenames/html/TimeIt/fb_platform/facebookapi_php5_restlib.php on line 3017" I am calling like this: $facebook->api_client->links_post($user_id, $link, $comment);