A number of organizations, including ProPublica, have developed
tools to let the public see exactly how Facebook users are being
targeted by advertisers.
Now, Facebook has quietly made changes to its site that stop those
ProPublica, Mozilla and Who Targets Me have all noticed their
tools stopped working this month after Facebook inserted code in
its website that blocks them.
“This is very concerning,” said Sen. Mark Warner, D-Va., who has
co-sponsored the Honest Ads Act, which would require
transparency on Facebook ads. “Investigative groups like
ProPublica need access to this information in order to track and
report on the opaque and frequently deceptive world of online