The agency has been handed a consumer lifestyle and trade media relations brief to highlight the breadth of Groupon deals - which include restaurant meals, days out and cosmetic treatments.
Groupon, which has suffered a rocky ride on the stock market since it first went public last year, also wants to entice businesses to reach new customers through its deals, which operate under economies of scale.
Brands2Life co-founder Giles Fraser said: 'Our role is specific - to communicate the value of Groupon's offers. They are the market leaders in a category they invented - part of the brief is making sure they continue that.'
The company launched in 2008 in Chicago, and was dubbed 'the fastest-growing ever' by Forbes magazine.
But after floating on the stock market in 2011, it has since seen its stock value shrink by two-thirds amid concerns about its business model.
The account will be headed by associate director Jodie Simpson.