facebook/facebook-php-sdk-v4 — pull request #236 by leonelsr (2014-09-12 05:35:36+00:00)
Title: Adding session_start() to the initialization docs.

Saves lots of troubleshooting (mainly when people are testing the API alone, without any framework or complete setup behind). See http://stackoverflow.com/questions/23522583/facebooksdkexception-session-not-active-could-not-store-state