Advertising is in a bit of crisis right now, according to Unilever vp of global media innovation and ventures Babs Rangaiah. The chaotic shift from analog to digital has left too many players, too much uncertainty and frustrated consumers. What’s driving consumers to use ad blockers is what ails digital advertising: bad ads that create a poor user experience, hog bandwidth and sometimes infect devices with malware. The wake-up call could improve advertising, Rangaiah said.