The Sun says Everton and United yesterday confirmed Moyes will leave the club in order to take the Old Trafford job on a six-year contract.
And before United revealed a deal for the Scot, the club's 33 million fans on Facebook got a glimpse into the future with a message to welcome Moyes.
Under the headline #UNITEDCONTINUED, fans were invited to send a personal message to the new boss.
The gaffe, which was soon removed, would have left Old Trafford bigwigs red-faced.
However, the news of the appointment was confirmed just a couple of hours later at 4pm.