The number of people using ad blockers isn't growing as fast as it used to, but it's a big enough segment of internet users to be a lingering concern for digital publishers. eMarketer’s Sean Creamer spoke with Rune Werliin, vice president of marketing and professional services at marketing technology company AudienceProject, about the state of ad blocking from the publisher perspective, and what to do—and what not to do—to persuade blockers to switch off their software.