Lately I got a message from Facebook about upgrading of our Facebook apps to OpenGraph2:
Update web apps
Add version 2.0 explicitly:
Update facebook connect
For facebook connect we using ‘omniauth-facebook’ gem. To update gem to latest open graph version you need to make changes in your configuration by adding :site => ‘facebook/opengraph2/2.0’ to ‘client_options’.
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You may test all changes in your app before deploying to production by turning all flags on in settings/migration tab.