Growth in Facebook's advertising revenue has slowed as the company faces challenges with ad targeting and measurement as a result of Apple's recent iOS privacy changes, according to the latest company report.

Why it matters

Apple's data privacy push has had a widespread impact on digital advertising and Facebook is also having to contend with declining user activity. Leaked documents, first reported by The Wall Street Journal, show daily Facebook user numbers among teens and young adults (aged 18 to 29) in the United States are in decline and are projected to fall by 4% and 45%, respectively, in the...