Site linked on facebook has no thumbnail image - Admin. help needed

hi, after looking thru the forum i've found 3 different posts asking how to make links posted on facebook come up with an appropriate thumbnail image, but none of them have an answer. Is it possible for a site built with iweb to do this, and if so, please tell us how. Thanks

The only solution is to write a piece of code into the header of the page and that will tell facebook where to pull the title, description and the photo from. The code that needs to be inserted is below.
THE PROBLEM - this solution doesn't work if you have built your site using iweb. Everyone that has iweb has responded to the solution (everywhere this is written about) has said this.
Does anyone know another work around?
The solution for anyone without iweb:
<meta name="title" content="INSERT CONTENT HERE" />
<meta name="description" content="INSERT CONTENT HERE" />
<link rel="image_src" href="INSERT LOCATION OF PHOTO WEB ADDRESS HERE" />

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