Google LLC is limiting access to key tools that track ad spending, disrupting hundreds of marketers and underscoring the powerful role the search giant plays in the digital advertising industry.
One recent change affects ad measurement companies — independent firms that monitor the performance of ads across Google, Facebook, Twitter and elsewhere.
Last month, Google cut off those companies from analyzing a popular type of Google ad shown on iPhones and iPads.
With your current subscription plan you can comment on stories. However, before writing your first comment, please create a display name in the Profile section of your subscriber account page.