Facebook posts $4.3bn profit as Zuckerberg laments 'hard year'

• Profit in final quarter of last year climbs on $12.7bn revenue
• Zuckerberg vows to make network 'good for wellbeing'

Facebook's profits soared 61%, spurred by growth in mobile users at the end of last year, the company announced on Wednesday, as co-founder Mark Zuckerberg said 2017 had been one of the company's more difficult years as a public company.

Zuckerberg has vowed to fix the issues at the social network, including concerns it was used as a platform for Russian meddling in the US elections. Facebook was also criticised over censorship and the addictive qualities of social media.