Scholar: controlling image when we link to Facebook

Hi:
When we link to or facebook share a post that doesn’t have an image – the default image/thumbnail is a logo of one of the strategic partners (you can see the list of them in the sidebar). I think this is confusing and some people may overlook or not click through on the links.

Is it possible to set a FEW logo default for linking to social networks?

thanks,
Terri