If the Facebook Share dialog does not display the proper elements of the page, such as:
There are tags that you can apply to your site page that Facebook recognizes as the elements to use for the different properties of the share dialog.
The tags are part of the Open Graph Protocol and can be reviewed here: http://ogp.me
Once you have the tags setup, its important to then run your page(s) through the Facebook debugger:
The debugger will report any issues or errors with the tags as well as update the Facebook Cache of meta data for your page(s).
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