Google has begun distributing a new release of Google Play Services to all Android devices, and along with it made a new SDK available to developers with a handful of new APIs. The main additions include a Google Analytics API, Tag Manager, Address API, Google Drive API, and updated support for Google Play Games. Google Play Services 4.3 is being pushed to hardware already running Android 2.3 Gingerbread and up. This encompasses the bulk of smartphones and tablets in use today.
Facebook is starting to approve additional "actions," verbs that let users go beyond Like. Developers can use Facebook timeline actions via the Facebook Graph API, but only if approved by the social network. Social shopping platform AddShoppers received approval for "want" and "own" and even has some Like-like buttons for those actions.
When Zappos released its API, there was a strange restriction: no mobile applications. While sometimes lawyers write terms that aren't formally enforced, Zappos made it clear on its API mailing list that it was serious. Soon, the restriction will be removed and mobile applications will be allowed without written approval.