At 4.50pm yesterday, the Britain's Got Talent judge and X Factor supremo tweeted his first words: 'It’s official, I know it’s taken a while. It’s really me! We’re live in 10 minutes. I’ll keep you posted. Lots of love #iamsimon.'
In true Twitter sleb form, Cowell is already getting into scraps with fellow tweeters. Piers Morgan has been taunting the Syco founder about trailing behind in follower numbers: 'Morning- still 1.3 MILLION followers behind me. As you would tell a contestant: 'There's a LOT of work to do, luv.'
Cowell responded to the baiting in his typical laconic style, tweeting a single line: '@PiersMorgan Look up the word deluded in your dictionary'.