The Irish music trend continues in the top spots as the second most watched video was a stirring rendition of the ballad Green Fields of France sung by Finbar Furey and Christy Dignam on the Late Late Show in January, while in third place are young Irish brothers Seán and Conor Price performing a modern take on Bob Dylan's All Along the Watchtower on X Factor.
In a continued effort to crack down on inappropriate videos, YouTube is expanding its content moderation staff, bringing the total number of people working across Google to address the issue to more than 10,000 in 2018.
"It was incredible, when we put the pilot up it was trending at number one for a week and it got a million views in like three days", Theo, 29, told AAP.
- This 12-year-old singing ventriloquist's wonderful performance on "America's Got Talent".
Luis Fonsi, left, and Daddy Yankee delivered YouTube's most-watched video ever, "Despacito".
The 24-year-old teacher wrote and performed the simple track which quickly went viral.
It's that time again, to jump into the way-back machine for #YouTube Rewind - YouTube's annual look back at the year that was.
It took "Despacito" just 204 days to become the most-watched video in YouTube history, the first to surpass 3 billion views and the only video to score more than 4 billion views, YouTube reports.
- This animated short film about a closeted boy who fears being outed by his own heart will melt your heart. The collaboration between Luis Fonsi and Daddy Yankee - and featuring Justin Bieber - has logged almost 4.5 billion views, the only video to surpass the 4-billion views threshold. It has been viewed nearly 1.1 billion times.