ICYMI: Influential, the largest influencer marketing firm in the world by revenue, was acquired by Publicis Groupe last summer. But in an alternate universe, founder and CEO Ryan Detert never mustered the confidence to follow his instincts and build the company. Through the nonprofit Big Brothers Big Sisters of America, Detert got the guidance and support he needed to be successful in life and business. His single mother signed him up believing he needed a positive male influence, and he’s been with the organization since—becoming a mentor (Big) for other young people…