Mobius won the business after a three-way pitch and will be responsible for activity relating to consumers recruited via Carling's , who are typically 18- to 24-years-old.
The site has been revamped and now includes content from the former music-based Carling Live site, as well as new lifestyle and gadgets content.
The site also features new football content and a weekly email to support the brand's sponsorship of the English League Cup, the Welsh national team, Celtic and Rangers in Scotland, and association with a number of English teams, including Arsenal.
Nicola Young, head of relationship marketing at Coors, said: "With the majority of our relationship marketing budget going on electronic media we hope this new activity will prove successful and popular with our members."
Coors Brewers has upped its digital spend for its Carling and Grolsch brands by up to 35% to an estimated £7m.
Berry Burgess, creative director at Mobious, said: "We're delighted to be working on such a prestigious brand, having faced competition from some of the best agencies down South."
Other recent wins include Australian telecoms company Telstra and the European business for US-based Universal Remote Controls.
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