When a user posts a link from a website on Reddit or Facebook or similar, they normally have an image associated with it.
Is there anyway of dictating what that image is in the header of the html file? I imagine that there must be a meta tag, similar to description and author, that allows this to be dictated?
I have searched Stack overflow for similar questions and the internet in general but couldn't find anything, which makes me wonder if my question is phrased wrongly.