Breef raised $3.5 million in funding to continue developing what it boasts as “the world’s first online marketplace” for transactions between brands and agencies. Greycroft led the round and was joined by Rackhouse Ventures, The House Fund, John and Helen McBain, Lance Armstrong and 640 Oxford Ventures. Including the new round, the New York and Colorado-based company has brought in total funding of $4.5 million since its inception in 2019 by husband-and-wife co-founders George Raptis and Emily Bibb. Bibb’s background is in digital marketing and brand building at companies like…