Social media star and Britain's Got Talent judge KSI has announced he is leaving the YouTube collective Sidemen after 13 years. KSI, whose real name is Olajide Olatunji, has made football, comedy and challenge videos with the group - which has 23 million YouTube subscribers - since 2013. His spokesperson confirmed to the BBC that he was leaving, after many of his followers voiced suspicions that it was a stunt. Sidemen said it "came as a surprise" but wished him well. "This is honestly the