The survey also found that a relatively high number of marketers were divorced from their ad placements. Some 42% said they didn't know where all of their ads were running.
That's certainly a problem in a climate where fake news easily proliferates.
Nearly seven in 10 marketers said they had encountered fake news on some type of digital channel, while three-quarters had run into it on a social network.
The poll revealed that more than half of respondents thought that their technology partners also bore some responsibility for addressing the problem of fake news.
That's in line with a separate survey of programmatic decision-makers in North America carried out by BrightRoll in April 2017. That poll found that 55% of respondents planned to put more pressure on their programmatic tech partners to screen out fake news content in the name of brand safety.