There's no intentional or manual effort at Google to promote pinterest.
Pinterest shows up because they understand how the Google algorithm works and built their website to display all the signals that Google looks for in relevant image content.
They understand user intent and generate URLs that present content in a way that google expects to see.
Examples of how they do this from their engineering team:
Pinterest shows up because they understand how the Google algorithm works and built their website to display all the signals that Google looks for in relevant image content.
They understand user intent and generate URLs that present content in a way that google expects to see.
Examples of how they do this from their engineering team:
https://medium.com/pinterest-engineering/demystifying-seo-wi...
More:
https://medium.com/pinterest-engineering/tagged/seo