Bit.ly, the URL shortener and analytics service from New York incubator Betaworks, has developed a software developers kit (SDK) that leverages the forthcoming deep Twitter integration in iOS5. The SDK will enable app developers to automatically share links on Twitter using branded URLs. ReadWriteWeb, for example, shares short links on Twitter automatically using rww.to. Employing the Bit.ly SDK our iPhone app will automatically do the same with the new Twitter iOS features.

The SDK is only available to developers who have signed an NDA with Apple, but it's available to check out on request. It's enough to make a person wonder what other kinds of APIs and SDKs will be built on top of the new Twitter features in iOS5. Twitter is a great platform, but there's no reason to believe that multiple layers of platforms will be placed on top of iOS, Twitter, location data, URL shorteners and more.