Simon Cowell at the London auditions for this year's X Factor. 07 Jul X Factor shake-up as Simon Cowell encourages auditionees to sing original tracks. The latest Tweets from The X Factor (@TheXFactor). Official X Factor UK. @ replies & tweets with # XFactor may be used on air or online. Full terms. The X Factor is a singing competition that has discovered stars such as Olly Murs, Little Mix and boy band One Direction. X Factor contestants · X Factor Finals · X Factor judges.