Twitter category vote - everything you need to know!

For the first time in X Factor history, viewers can vote via hashtag on Twitter to determine which of the Judges is allocated each of the four categories – the Girls, Boys, Groups and Overs.

Tweet a hashtag with the name of the judge followed by the category you would like to see them mentor.

Voting will open as announced during the broadcast of the Programme on Saturday, 29 August 2015.