The official Java SDK allows to record Keen.io data from any Java application. Resources available on GitHub include an Android quick start with installation, gradle, maven, and JAR download. Some of the usage instructions explain how to build a keen client, use the KeenClient singleton, and work with the source.
Twitter has a popular iPhone app, but now some of its functionality is also built into Apple's latest mobile operating system, iOS 5. Tweeting a photo from the default camera app is now a tap away, as is tweeting a link from Mobile Safari. Tweeting is also built into the SDK, making it available via other applications without needing separate Twitter authentication.
A year ago we asked who belongs to the API billionaires club and listed several APIs that can count their API requests in the billions. Now there are many more API billionaires serving billions of requests every month. There is also a class of eight companies that are serving in the billions every single day, as shown in ProgrammableWeb Founder John Musser's talk today at Glue.