jdavis/twofactorauth — pull request #756 by mxxcon (2014-09-05 14:11:28+00:00)
Title: Removed 'in progress' from Slack in communicatoin.yml

According to https://twitter.com/SlackHQ/status/492192845038895105 they are not actively working on 2FA, but it's on hold while they implement SSO.