Choosing Thumbnail For Facebook Fan Page Link?

I posted an update to a Facebook Page today via Ping.FM and it worked fine. The updated contained a link, so Facebook posted a thumbnail. I like the concept, but it seems to have just grabbed the first image on the page, which is the Twitter logo. So, the article title is posted next to the Twitter logo on the Facebook Page status update. Is there some way for us to decide which photo on the linked page gets used as the thumbnail?