Ad blocker usage surged 30% in 2016 , according to a new report from PageFair, a company that helps publishers regain revenue lost to the software. There were 615 million devices blocking ads worldwide by the end of 2016, 62% (308 million) of those mobile. Desktop ad blocker usage grew 17% year-on-year to 236 million. PageFair noted that 90% of ad blocker users surveyed have encountered an “ad block wall” that blocked them from viewing content unless they disabled their ad blocker. However, almost three-quarters (74%) of those users said they simply left those websites rather than performing the steps required to whitelist them.