You may soon be able to "Digg This" from within your applications. The social news site's API (our Digg API profile) has long been able to list stories and other data. Now it's looking to let developers add content programmatically.
A few months ago, ProgrammableWeb announced the release of Heroku’s Platform API, which allowed developers to integrate the Heroku platform with third party applications and services. Now, Heroku has launched a public beta for OAuth 2.0 support for the Platform API. OAuth 2.0 support allows developers to control service needs as opposed to offering full service access to all user accounts.
Discussion of Google's recent acquisition of Jambool has largely centered around its virtual currency platform, Social Gold. The power behind that platform comes in the form of the Social Gold API. Again, Google has bought a company whose API is central to its success.