If a user posts a link to a topic on social media or something like that often an image is loaded.
My discourse installation per default displays the autor profile picture of the last editor in this topic.
Is there any way to change this to the forum logo?
There has to a way to modify this, isn’t it? 
i want to change it to show as real topic image, my topic images are hosted on external public sites, can anyone help me how can i force overwrite the meta og:image tag to load my public images? see my problem here Topic List Previews