Official Google Shopping Content .NET SDK by Google. It contains API Key access and OAuth 2.0 access. In addition, this resources shows web applications, service accounts, and installed applications with the aim to facilitate API interaction in .NET language.
Blippy and Swipely both launched fairly recently with the hopes of making spending a social experience. Both services are very similar in that they both allow you to connect your bank and credit card info, as well as other accounts like iTunes and Amazon. After you've set everything up, as you start spending, you have the option to share these purchases with everyone. And now you can extend that sharing with the Blippy API.
I thought the social network space was filled up by the likes of Facebook, Twitter, Google+, kind of like how online bookstores have been dominated by companies led by Amazon. Sure, there are new social network competitors, but we grok the beast. But just when LinkedIn seemed to define the boundaries of social networking, Instagram comes out of nowhere and suddenly we understand less than we thought. Far from set in its ways, of social networking is being rocked by waves of game changers. In an article in Fortune, HootSuite CEO Ryan Holmes serves up 7 contenders to watch in 2013.