Fuller's lager brand created a special series of advertisements that can only be revealed using Instagram filters

Some of the best advertising campaigns let potential customers in on a secret, and Frontier has the biggest secret of all: blank ads that are only revealed on Instagram.

The lager, a product by British brewing company Fuller, has created a blank ad that could only be revealed by taking a picture on Instagram and using filters to uncover the picture of the pint hidden within.

Created by Matthew Lancod and Robert Amstel of The Corner, posting the picture of the revealed ad with the hashtag #FindFlavour would enter them to win an undisclosed prize, most likely free beer. The posters will be placed throughout East London and will run for two weeks. Those looking to win the mystery prize don't have much competition yet as the campaign launched Monday and there is currently only one entry on Instagram with the correct hashtag.

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