12 biggest ad reviews of 2021: From Meta to Coca-Cola, this year saw some monumental agency shifts.

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      In September Anheuser-Busch InBev launched a global media agency review but only invited incumbents, setting up a showdown among Dentsu, Publicis Groupe and WPP. Walmart In August, Walmart handed its U.S. media account to Publicis Groupe following a review for the business previously handled by WPP-backed Haworth. [Extracted from the article]
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