Were radio DJs from the '60s, '70s, and '80s the original "influencers?" Maybe so. But today's social media pitchmen and pitchwomen are likely pocketing a lot more revenue than radio personalities ever made from bar nights, phone store grand openings, and live endorsements. Is "influencer marketing" a place where still-popular radio personalities can go? And what can they learn from both teenage and geriatric influencers with big followings and the ability to sell lots of stuff?