Vizeum will plan media for Blyk with a specific focus on developing a digital media plan for the brand.
Account managers will be Ben Wood, managing partner of Vizeum, and Nick Dickson, digital group account director, also of Vizeum.
Blyk recently announced that it has hit its target of signing up 100,000 members six months ahead of schedule.
Blyk's strategy has been to use interactive, relevant advertising messaging to build relationships between brands and the hard-to-reach youth market, and claims to have achieved a 29% response rate across all of its campaigns.
Dean Merrion, director, member sales and marketing for Blyk, said that the mobile company was impressed by the raft of youth brands on Vizeum's roster.
Ben Wood, Vizeum managing partner, added: "Now that it [Blyk] has successfully reached its 100,000-user milestone, we'll be concentrating on growing the base further through a spectrum of digital media and affiliate channels, coupled with WOM and advocacy programmes."
The news follows last week's appointment of Christopher Bennett as Blyk's commercial director, who will oversee the network's advertising strategy.