I have been looking everywhere and can't figure this out. So I figured I would ask here. Why is it that when I post a video link on my Facebook timeline, sometimes it displays as a small image with the link, and sometimes it is posted as a large image with the link. I've compared two different posts of mine. One that showed with a small Image and one that showed the large image. I can not for the life of me figure out the difference and how to make all the link images appear large. I am not uploading pictures. I used youtube video posts from my website for the test. Maybe its something with Facebook and not my posts? Any Ideas? Thanks!