Facebook API versioning

Facebook's Platform supports both versioning and migrations so that app builders can roll out changes over time. Goal of versioning: The goal for having versioning is for developers building apps to be able to understand in advance when an API or SDK might change. They help with web development, but are critical with mobile development because a person using your app on their phone may take a long time to upgrade (or may never upgrade). Faecbook recommends to use graph-api version 2: Older versions of Facebook's API will expire April 30, 2015 and there are some significant changes between the