Kit Kat crowd-sourcing a new bar.

In a move to determine a new flavour, Kit Kat has turned to social media to find out which flavour "chunky" bar is most popular between mint, coconut, fudge and hazelnut.

The campaign is similar to one they ran last year, where consumers were asked to vote for their favourite chunky from a selection, via text message. This time round the company is using Facebook as the voting medium.

To vote, you need to go to the Kit Kat page, where there's an app which is 'like-gated', meaning you must like the page before you can vote, then finally you can choose your favourite of the four flavours.

The Facebook campaign runs alongside a television advert, with the flavours given the persona's of superheroes albeit cumbersome ones.

This is a clever use of social media and crowd-sourcing by the company, one that saw peanut butter chunky being voted winner last time around.