The 25-year-old’s video, Industrial Revolutions, shows him performing BMX stunts in a disused Scottish train yard.
Released on August 15, it is already approaching 2.4 million views and has been “liked” more than 28,000 times.
The film came third in social networking site Mashable’s Global Ads Chart, which compiled a list of the 20 most shared videos in August.
It was only beaten in popularity by adverts for Nissan and DC Shoes, but was ahead of Justin Bieber videos.
The film includes an amazing high-wire act where Macaskill walks along a steel cable before riding down it on his bike.
He also performed new versions of his trademark gravity-defying trick of riding up walls and other flat surfaces.
With only the help of a small ramp he managed to fly several feet up a brick wall.
He can also be seen leaping off rooftops and hopping over precipitous gaps.