Ex-WPP boss' fledging venture grew by more than a third in first quarter of 2019.
Slowdown in retail giant's 'other' services is greater than expected.
Facebook believes the landmark US Federal Trade Commission fine over privacy breaches could be as much as $5 billion.
The social platform stops reporting monthly user numbers and is replacing declining count of monthly users with 'monetisable daily active users'
Last week's revelation that Audi is putting its UK ad account up for pitch provoked sympathy and antipathy in equal measure.
'We have learned a lot,' Publicis Groupe chief executive insists.
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