Hi can someone confirm, does Pinterest use Open Graph Protocol?

If you use the Pinterest Widget builder - Button and Widget Builder | Pinterest for Business

Will the image you place in the widget replace the image Pinterest selects if it does use the Open Graph Protocol?

The site already uses Open Graph Protocol for Facebook and Google+. It also uses Twitter cards for twitter. It would be good if we don't need to add more html (such as from the Pinterest widget builder) for Pinterest.

Another question i forgot to ask - if you're implementing a social media share widget (such as: ShareThis - Get the Share Button) which included: facebook, twitter, google plus, etc Do you have to still create and add Open Graph Protocols e.g. og:url, og:url, og:image ?