Automattic/jetpack — pull request #134 by bbrooks (2014-01-25 21:49:42+00:00)
Title: Update Jetpack_SSO to be a proper singleton

Remove usage of ‘new Jetpack_SSO’ in favor of Jetpack_SSO::get_instance
to emphasize that Jetpack_SSO is a singleton. Made the constructor
private.

Resolves: https://github.com/Automattic/jetpack/issues/95