For efficiency and speed reasons, Facebook maintains a cache copy of all sites and pages that are shared on Facebook.
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As a result, you may notice that the details or images displayed when you try sharing a link on Facebook are not the current ones you are expecting. Although, we have no details on how often Facebook updates their cached copies of your store pages, it is possible to force Facebook to refresh it by trying the following.
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Simply go to the link below and type in your store's url.
​ http://developers.facebook.com/tools/debug
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This has worked for our members who have needed to do just that so hopefully it should do the trick for you too.
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Please do let us know if this does not achieve the desired result.