I'm trying to add a default image which will appear when I post a link to my blog elsewhere (say, in a Facebook message). I've tried everything I can think of but when I post a link to any of the pages / posts it just comes up with a blank square next to the description.
How do I add a photo which will automatically appear when I or others post links to my blog? Looks very unprofessional otherwise :-(
Thanks in advance!
The blog I need help with is www.themoonisanakedbanana.com.