Google Cracks Down on Marketers' Access to Data

Third-party measurement firms fear being shut out

Google is tightening its grip on advertising data, and some industry sources fear the policies could hamper their ability to market online.

Just this week, Google began talking to ad technology partners about restrictions on how they gather data when running campaigns on the Google Display Network. Some sources said the timing was odd, coming on the heels of Facebook's launch of Atlas, an ad server and data platform that many say is the biggest rival to Google's dominance.

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