Sir Martin Sorrell: Facebook row hasn't deterred advertisers

Ex-WPP chief says marketers are turning to Instagram and predicts more digital growthAdvertisers are declining to join the backlash against Facebook, according to Sir Martin Sorrell, despite a year of scandal at the social networking giant.Facebook still enjoys a near-duopoly over digital advertising alongside Google, even though investors have wiped nearly a third off the company’s value this year. The firm has faced criticism over the distribution of fake news on its platform and the rev