Does anyone know the exact rules of the Facebook sharer thumbnail?
From my understanding, what it is supposed to do, is look at the <head> and find the <meta type="of:image"> and have that as the default thumbnail, but what it should also do, is crawl the webpage, find all the images on it, and have it alternative thumbnail options.
Am I completely wrong here?
Take a look at this site for example, http://a-d-c.net When on the Homepage, click on the Share link (select Facebook one) on the bottom nav, I can only see 3 thumbnail options, even though there are plenty of other images on the page.
Can anyone explain how Facebook decide which images are 'allowed' to be used as the thumbnail?
Kind Regards