Youtube personality KSI is one of the most powerful social media stars in Britain, according to a new list released today.

The 23-year-old, whose real name is Olajide Olatunji, begun his career by filming himself playing Fifa in his bedroom in Watford ten years ago.

He now has 16 million YouTube subscribers, 2.75 million Twitter followers and 4.4 million on Instagram.

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Known for sporting challenges, video games and prank videos, the Youtuber has also launched a music and writing career.

Social media research firm Fizziology ranked influencers based on their social reach and average engagement across social platforms, as well as their cultural, political and social influence.

Beauty blogger Zoella was crowned the most powerful, while professional gamer Dan Middleton, 25, placed fourth, with beauty expert Tanya Burr, 27, in fifth.

Other stars include model Iskra Lawrence, 26, at seventh and fashion and beauty vlogger Louise Pentland, 31, at eighth.