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Hello! I just ran the page through the Facebook debugger: https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fwww.laserfiche.com%2F which re-caches the page, and it looks like it's pulling the logo fine? It is doing a 302 redirect to the US-EN version of the site that you might want to check into (not sure if it should be a 301 or not?). If ever you have an issue with Facebook, be sure to run the debugger to get the page re-cached. I find that often helps! Hope that helped a bit. Jen

This is a neat idea and like Oleg said should be straightforward for you to do if you just cookie all visitors.  You could then check  what cookie they have, and show the defined images (or pull several images from your DB).  I don't know of any "pre-made" tool that will do this for you, dynamic remarketing through Google adwords is somewhat similar but that is showing a set of images to users who are no longer on your site (user goes to x product page, and are shown x product later when they are watching video on youtube  ect...)