Facebook digital ad figures differ from census data

SAN JOSE, CA - APRIL 18: A view of the booth demonstrating Facebook Spaces at Facebook's F8 Developer Conference on April 18, 2017 in San Jose, California. Facebook CEO Mark Zuckerberg delivered the opening keynote at the F8 Developer Conference that runs through April 19. Justin Sullivan/Getty Images/AFP == FOR NEWSPAPERS, INTERNET, TELCOS & TELEVISION USE ONLY ==

SAN FRANCISCO: Figures that Facebook Inc gives advertisers about its potential reach differ from US census data, an investment analyst said, renewing questions about how tech companies verify the value of their digital marketing space.

Facebook, Alphabet Inc’s Google and other Internet companies have faced persistent scrutiny from advertisers about how many people watch ads online and how to measure their views.