levo - 6:52 pm on Mar 5, 2012 (gmt 0)
Try creating an extended version of your sitemap for Google, one that includes images & videos for your pages, which helps associating images to your pages. (Note that not a image sitemap, a sitemap of your pages that includes images etc. [googlewebmastercentral.blogspot.com...] )
BTW, Facebook doesn't hotlink, because it copies & hosts your images on its own servers.