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New Post: Facebook and thumbnails

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Hello,
I'm having troubles with my blog and sharing it's posts to facebook.
Thumbnails does not appear on facebook. Initially if I share blog post no thumbnails are shown (even if there one or more big images (600-900px size).

I've tried adding something like <meta property="og:image" content="http://ripicts.com/media(5adc099b-a7b4-41d7-9c9e-88dff46b4bce)" /> to head part of the blog. It didn't help with facebook, however it helped with one other web site that also supports open graph conventions.

Then I've flowed suggestions. From what I understand they suggest a way to avoid thumbnail caching on facebook. But that didn't help. Moreover if I put something like http://mywebsite.com/_blog_post_url_path?facebookupdate=123 with some parameter it loads my facebook avatar instead of a thumbnail. Very strange and unexpected behaviour.

I've tried to figure out what is wrong by using facebook OG debugger:
and found out that it says _og:image should be larger:

Provided og:image is not big enough. Please use an image that's at least 200x200 px. Image 'http://ripicts.com/Renderers/Captcha.ashx?value=41-8F-22-6A-5C-3A-D8-FE-9E-01-E7-66-48-35-9F-B5-8F-C4-D4-E5-1B-83-AE-3E-9D-AF-38-E1-DC-29-70-BC' will be used instead
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Capcha image also does not appear as thumbnail
It shows my image correctly in icon, but just think it does not pass validation and throws less than 200px error.

If i remove "og:image" tag from my blog post then debugger shows my images correctly but facebook website does not see it.

Then I"ve tried to share links from that thread i mentioned above and they did work. I went to see the code and I have not found any "og:image" parts, but image urls looks different from what mine.

My Comosite visual editor creates something like:
src="/media(5adc099b-a7b4-41d7-9c9e-88dff46b4bce)"
On the web site from another topic urls looks like:
src="/media/6b8f9592-da6c-49e0-bf5d-0a3499987ec0/Bios/Bio-Brian medium.jpg"

As far as I understand src="/media(5adc099b-a7b4-41d7-9c9e-88dff46b4bce)" it is not the actual url, but rather some kind of redirection and either facebook does not work with redirections or doesn't like if links without imae extensions (.jpg, .png etc). But against the last theory I've tried to write something like src="/media(5adc099b-a7b4-41d7-9c9e-88dff46b4bce).jpg" what does work with composite but no good signs from facebook.

I've spend quite some time and don't know what else I can do. I'll be happy to hear some ideas.

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