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URL Linter – http://developers.facebook.com/tools/lint
Facebook’s URL Linter is an extremely handy tool for testing an instance of the Facebook like button. It allows you to view how it will look in the Facebook feed. If you’ve ever tried to test a like button you know that Facebook caches the results for an unknown amount of time which can be very frustrating while trying to test.
It’s truly a priceless tool.