Federico de Nardis, CEO of GroupM's Maxus Italy, has been promoted to CEO of Maxus Europe, Middle East & Africa. De Nardis, who splits his time between the agency's Milan and Turin offices, will retain his current responsibilities in Italy.

Aegis Media Americas and Aegis Media EMEA CEO Nigel Morris has joined the board of the U.K.'s Guardian Media Group as a non-executive director.

Jeff Karp, Zynga's chief marketing and revenue officer, is the latest high-level executive to leave the embattled social games company. His resignation follows news earlier Monday that CTO of infrastructure Allan Leinwand was leaving Zynga to join cloud service company ServiceNow. Other who have left in recent weeks include COO John Schappert, Chief Creative Officer Mike Verdu, and Alan Patmore, general manager of “CityVille,” one of Zynga's best-known games.

Coca-Cola was the top-performing social media brand in August, according to the latest ranking published by social marketing platform Optimal. The company bases the ranking on an index that combines data including fan counts, engagement statistics and “global fan valuation” to provide a baseline for estimating the value of a brand's social media presence. Coke showed an index growth of 1,425 points in August, followed by Reese's (1,378), Monster Energy (1,068), Pepsi (948), and CoverGirl (858). One component of the Optimal Index is the raw growth in the number of …

Ahead of the iPhone 5 unveiling Wednesday, Nielsen on Monday said 55.5% of U.S. mobile users own a smartphone as of July, up from 41% in the year-earlier period. Nielsen tends to be more aggressive than other research firms with its estimate of smartphone penetration, so that figure is probably among the highest out there. For instance, comScore puts smartphone ownership at 49% of the U.S. mobile market as of July.

Mobile marketing technology firm Augme Technologies has appointed former Ogilvy & Mather executive Tom DeLuca as chief operating officer. DeLuca, who will also serve as COO for Augme subsidiary Hipcricket, replaces Robert Hussey, who has been interim COO since June and will join the company's board of directors. DeLuca most recently served as COO for Social@Ogilvy, the agency's social media division, whose clients include Ford, IBM, Nestle and UPS. Prior to Ogilvy, DeLuca was VP, worldwide digital marketing at Warner Bros. Home Entertainment, and was previously founder and president …

Goodby, Silverstein & Partners has named Executive Creative Director Margaret Johnson a partner. She is the agency's first female partner.

Spotzot, which operates a platform powering mobile coupons and offers, has rolled out new features and options for its SpotAds that run ads in shopping and location-based apps and mobile sites. The company's platform aggregates in-store and online promotions from the top 1,000 U.S. retail chains spanning 500,000 individual stores and serves them and converts them into SpotAds—mini-catalogs of similar offers targeted based on criteria including location, retailer, brand and a user's interests. Spotzot is now offering “exclusive” SpotAds …

GroupM's MediaCom unit has named Corinne Pessus CEO of MediaCom France. She had been managing director of Publicis' Starcom France,

  The third season of Univision's reality-competition show “¡Mira Quién Baila! 3” (Look Who’s Dancing!) has re-enlisted a number branded entertainment partners -- as well as adding some new ones.   Returning marketers include Target, State Farm, and Nescafe Clasico with Honda and Verizon coming on as new branded entertainment partners.   Co-produced by Univision Studios and veteran reality show producer Endemol, “¡Mira Quién Baila!” will air Sunday nights, beginning on September 9.