Facebook sharer not getting the right image

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Well like I said, this was working fine before, yes Vbulletin does that of pulling the image from the posts, yes it was a Vbulletin issue.
I finally found the problem after days of playing back...

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Ok, so what is this code on my header?

<vb:if condition="$vboptions['facebookactive']"><meta property="fb:app_id" content="{vb:var vboptions.facebookappid}"

...

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The 'og:image' property should be explicitly provided

That is the issue.
Why Facebook is saying that about my forum? That is what I need to know.

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No it was not luck, it was working fine like it suppose to work always. After a website restore it stopped working....

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No I dont have that mod installed....

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Like I said, this was working fine before, Facebook was pulling the correct images from the posts, it suddenly stopped doing it, what it could be?...

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Like I said before, this was working fine as it is suppose to work, grabbing correctly any image or YouTube video image the right way, the correct image was being scrapped and used on facebook sharer....

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I do not want to use an specific image, I want to grab an image from the post like it was doing before. I have not used that field before and it was working fine. Maybe something on the template is missing?...

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Yes is set to yes....

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nobody knows?

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This was working fine and suddenly it started not working, maybe someone can bring me some light on this.
When I try to share a post from the forum to Facebook, the sharer is not getting the right...

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My forum was hacked and all files removed. The DB is intact and tested. The question is, to bring my forum back to life I just have to reupload the files? If I avoid the installation wizard because the...

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i did not had the install folder, i deleted the folder after initial installation...

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My forum was hacked this morning, al files were deleted and 2 files were uploaded to the root of the website, DB appears to be intact so far. one file is the index.php with the hacker message and the...