[Facebook’s guide to sharing][1] details some meta tags to make that sharing work better:
In order to make sure that the preview is always correctly populated, you should add the tags shown below to your html. An example news story could have the following:
>
> As shown, title contains the preview title, description contains the preview summary and image_src contains the preview image. Please make sure that none of the content fields contain any html markup because it will be stripped out. For consistency’s sake, please use the
>
> <meta />
> tag to provide text data for the preview, and the
>
> <link />
> tag for any source urls.
>
> The title and summary tags are the minimum requirements for any preview, so make sure to include these two.
[1]: http://www.facebook.com/share_partners.php "Facebook | Share Partners"