How to make only logo show when linking?

Friends, I notice that when I plaster the web with announcements of new issues of the journal, only the center of the banner image displays, so it’s just part of one word of our title. But what I really want is for the logo on the left side of our banner to show instead. How would you suggest making the logo be the thing that appears when posting links to our journal on fb and such? For reference, the page is here: Feminist Philosophy Quarterly