To be clear, this tool really refreshes Facebook's cache of a particular page. In addition, this tool doesn't clear any caches in Facebook pages. Rather, it checks third party pages for updated content.
https://developers.facebook.com/tools/debug
I came across this while posting a status update with a link on a Page I manage. The link's preview showed some outdated information, which I knew had been updated already. Using this developer tool helped to update the cache to show the current information on the link preview.
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