Microsoft has announced a partnership with the Pinterest, which allows users to use Bing image search to pin pictures to their boards.
The Pin to Pinterest button has been integrated into bing image search, allowing users to add images to their collections without the aid of 3rd party apps/browser extensions or browser booklet.
You just search for a image on Bing image search, find the image you would like. Then open that image and the bottom you will find the pin to Pinterest button, where you just click on it to add that image to your board
All images pinned from Bing image Search also provides a link to the original hi-res source with correct attribution, which is really useful for bloggers.