FlickrNet is a .NET library for implementing all of the Flickr API's methods. It is designed to reduce the complexity of calling the API, especially with regards to authentication. This library can be accessed from a variety of frameworks and is written entirely in C#.
The Bigstock API was built for Facebook applications, print on demand services website builders, ecommerce platforms and ad creation tools. You can use the API to perform five request types: search, categories, image detail, purchase, download, and light boxes & saved images.
Facebook has rewarded a 10 year-old boy from Finland with a $10,000 bounty for discovering an authentication-related vulnerability in the Instagram API that could have enabled a hacker to delete comments of any user on the popular social photo sharing service even without an Instagram account.