A seven-year-old American boy who reviews toys has topped a list of the highest-earning YouTube stars after making $22 million (Rs 155 crore) in a year.

Ryan, from Ryan ToysReview, made the sum for his online reviews between June 2017 and June 2018. Since launching his main channel in 2015, Ryan has amassed more than 17 million followers and close to 26bn views.

The online sensation Jake Paul was second on Forbes' list, with £16.8m. His raps and jokes were viewed more than 3.5bn times over the 12-month period.

According to the magazine, the vast majority of the money made through Ryan's channel came from adverts that run before his videos start.

It said such ads accounted for about 96% of the revenue – or about £16.5m. It said the remaining money came from sponsored posts.