Limited images to choose from when posting to social specifically LinkedIn

[Anonymous]

I've been running more sponsored updates on LinkedIn and ocassionally dropping in a landing page created in marketo for a specific asset (white paper, solution breif, etc.). The issue I'm running into is the inability to choose the correct thumbnail in LinkedIn. i.e. When I go to share this page: http://www6.nasuni.com/the-best-backup-is-no-backup-solution-brief.html
The only image that comes up as a choice for me to select is the customer logo. I'd obviously like to choose our asset thumbnail. Is there any reason this is happening? Is there a workaround? The image file for our asset is a PNG, though I don't see that mattering. 

Any help would be much appreciated as this is really cramping my sponsored post advertising style!

LA

[Kenny_Elkington]

Hey Louis,

LinkedIn has some very specific parameters for images which can be used in the share.  It's best to declare a canonical image for linkedin as described in the 'og:image' section here: http://developer.linkedin.com/documents/setting-display-tags-shares