Two-thirds of Irish iPhone users do not allow apps to track them, Wolfgang Digital finds

Falling growth has led to a huge drop in Facebook parent’s value

Social media giant seen as most exposed to user privacy changes introduced by Apple

Social media giant lobbied Paschal Donohoe on proposal in January meeting

Tech giant will stop booking much of its global sales through Dublin

Tech giant will in future book revenues in the countries in which they were earned - shrinking the firm’s Irish tax bill

Mobile ads accounted for 69 per cent of advertising revenue

Company says it is preparing for a a 55 per cent to 75 per cent spike in expenses next year