The backlash that can occur when ads are placed alongside hateful online content is severe enough that some brands are pulling back on online spending and rethinking their digital media strategies. Despite promises that they would do better, platforms like YouTube, Facebook, and others are still struggling with the issue. Brands don't want their ads appearing alongside extremist content and hate speech, but flagging every piece of content that could be considered inappropriate is not an easy task. The challenge has opened the door for a new industry of "authenticators," which use technology to help brands avoid inappropriate content online. Using artificial intelligence and machine learning, these technology providers are usually able to evaluate the quality of an ad impression in real-time and help their brand clients avoid anything that could be considered inappropriate.