| http://www.w3.org/ns/prov#value | - Dr. Joseph Mercola, the natural health expert and New York Times bestselling author who founded Mercola.com in 1997, says that the annual Black Friday Sale is a show of gratitude to over 1.4 million newsletter subscribers and concerned citizens who help spread the word on various health advocacies, especially on Facebook, Twitter, and other social networking sites.
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