The complaint also alleges that Facebook, over many years, has imposed anticompetitive conditions on third-party software developers' access to valuable interconnections to its platform, such as the application programming interfaces ("APIs") that allow the developers' apps to interface with Facebook. In particular, Facebook allegedly has made key APIs available to third-party applications only on the condition that they refrain from developing competing functionalities, and from connecting with or promoting other social networking services.
The complaint alleges that Facebook has enforced these policies by cutting off API access to blunt perceived competitive threats from rival personal social networking services, mobile messaging apps, and other apps with social functionalities. For example, in 2013, Twitter launched the app Vine, which allowed users to shoot and share short video segments. In response, according to the complaint, Facebook shut down the API that would have allowed Vine to access friends via Facebook.