Scrapbook for Pinterest 4.4 - "Search improvements
Some users may have had problems seeing no search results on Mango phones. This issue is now addressed.
Sharing to Facebook and Twitter
Users who have linked their Facebook and Twitter accounts to Pinterest will now have an option to also share their uploads or repins to those sites when adding a pin.
Repinning, pinning, commenting and liking
We temporarily took out the ability to repin, pin, like and comment on items from the app. This function is back." from All About Windows Phone