Comment by endorphone

News aggregation operates under a very different model, and Google is constantly negotiating with news vendors.

>How can a search engine be useful if it doesn't include the most popular sites?

News has a relatively tiny set of providers. Information has a massive set of providers. Hence why Google can call the shots if you want to be in their engine. Pinterest only recently started getting ranked highly, owing to a weighting change, and it is a negative result for almost everyone.

You repeatedly keep citing the results themselves as validation that the results are correct. That isn't how it works, especially in the face of users saying "these Pinterest results suck and reduce my experience". Google constantly changes these things.