XF 1.5 How to change xenForo logo when sharing on FaceBook

#1
When I share a link to a post on my xenForo forum on facebook, it displays the xenForo logo even though I have my own logo displayed on the forum... Is there a general image that FB is pulling that I can change?
Anyone else having this issue or was able to change it?

Thanks for any help...

Matthew
 
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