PageFair remains the source of most estimates of the ad-blocker user base. The firm partnered with Adobe in 2014 and 2015 to produce a survey of the ad-blocking landscape, estimating that 4.9% of internet users worldwide, or 144 million per month, were using ad-blocking software in Q2 2014, a nearly 70% year-over-year increase. The number of ad-block users worldwide rose to 198 million by June 2015, according to the August 2015 version of PageFair/Adobe report, equal to 6% of all internet users. The US contributed 45 million to the total, equal to 16% of US internet users.
June 2015 figures from the Reuters Institute for the Study of Journalism at the University of Oxford suggest an even higher overall number are using ad blocking in the US: 41% of PC users and 11% of mobile users reported regularly using ad-blocking software, and usage rates in the UK weren’t far behind. Read the rest at eMarketer.