I'm currently sharing via Facebook, Twitter, Pinterest, and Google+ One. I know Facebook is unique in that it requires the options to be set-up in the meta so I'm pretty sure it can't be done there given that it's a single page, but what about the others? Any ideas?
Instructions for updating the shared content dynamically are available here: http://support.addthis.com/customer/portal/articles/381263-addthis-client-api#updating-configuration
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