Saying goodbye to one of his toughest years filled with several controversies, Facebook CEO Mark Zuckerberg said he is "proud" of the progress in 2018 and the company has now established multi-year plans to overhaul its systems and is executing those roadmaps.

In a year-end note on Friday, the 34-year-old Zuckerberg said his personal challenge has been to focus on preventing election interference, stopping the spread of hate speech and misinformation, making sure people have control of their information and ensuring his services improve people's well-being.