Think signing petitions is useless? There's probably an app for that. But Change.org proves the cynics wrong--every day. And now there's a Change.org API to rattle the powerful even further. The API is in beta, is free, and uses REST with JSON returned. The API covers a multitude of requests from creating petitions to checking signatures, from looking at the case for a petition to updating them.
Expion, a Social Media Management System (SMMS) company, specializes in helping companies manage their brand images on social networks, from Facebook to Youtube to Twitter, often relying on partners' APIs to pull of some of their more interesting feats. Most recently, it was chosen by Google as a Google Plus API partner for the brand-focused Pages feature.