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Publishers could also try to protect their content from Google by forbidding its web crawler from sharing any content snippets from their sites.

The company’s patent application details its use of a “web crawler” to acquire images, even noting that “online photos associated with a person’s account may help to create additional records of facial recognition data points,” which its machine learning algorithm can then use to find and identify matches.

The company originally operated a web crawler that searched for GIFs on the internet.

He rewrote the code for a slow web crawler that Mr. Page had created to understand the relationship between links on different websites.

He went on to explain how one could use a Web crawler to capture masses of data and mark voters as having been contacted by the campaign in order to alter its metrics.