Automatically posts inappropriate pictures to facebook

I’m using the Jetpack Publicize to publish my posts to facebook. If I do not designate a featured image, the same one seems to get chosen automatically each time. The trouble is, that image is highly inappropriate. It’s the storefront for a venue where I have performed one time that probably doesn’t want to be associated with my every post. My own logo would be a lot more appropriate. Is there any logic to which one is getting chosen? How can I change it?

It is posting to
https://www.facebook.com/FreedComedy
The post is
http://freedcomedy.com/because-im-fat/