Having issues with Facebook and LinkedIn Social Sharing - facebook

This one has been driving me crazy!
I"m trying to get social sharing to work on Facebook and Linked in for my business. The site in question is www.helio.com.au - i've got all of the og:foobar tags in the header but for some reason they are not being picked up by facebook or linkedIn
Here is a link to the LinkedIn inspector
https://www.linkedin.com/post-inspector/inspect/www.helio.com.au
Note that linkedin doesn't find the image
And here is one for facebook
https://developers.facebook.com/tools/debug/?q=www.helio.com.au
facebook says the image has an invalid content type, it's also pulling the wrong URL and I can't figure out where from.
What stupid mistake have I made?
The site is built on salesforce communities

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http://developers.facebook.com/docs/reference/api/post/
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