Austin, TX-based GSD&M, part of Omnicom Group has been selected by restaurant chain Chipotle for advertising and media planning and buying duties. The client spends and estimated $50 million on advertising annually.

Part of a recent Mercedes-Benz online advertising campaign was viewed more often by automated computer programmes than by human beings, according to documents seen by the Financial Times. The ads were inadvertently placed on to fraudulent websites by Rocket Fuel, a Nasdaq-listed ad technology company that went public last September with a market capitalisation of nearly $1bn. The incident will intensify concerns about the prevalence of fraud in the fast-growing online advertising market, which expanded 15 per cent last year to $120bn.