I frequently submit webpage links online, and in some cases I am able to select which thumbnail I want to display with that link, ie with Facebook. However, most of the time I am not able to select a thumbnail, and the image that is displayed is usually the large blank rectangle that is underneath my images, or some other geometric image - never one of the jpegs that is on that page. Does anyone know if I can designate a jpeg thumbnail to be associated with a specific page on my website, so when I submit a link, you can see a relevant image and not a blank rectangle? Hope I explained that sufficiently.