How to Invite Guests on Slack on iPhone or iPad: 13 Steps
Confluence Mobile - Confluence
The Complete Guide to Slack Channels
Slack Support Guest Ch... | Magestore Handbook
Slack on Twitter: "@ojrask @chriscoyier Correct! As Multi-channel guests are paid accounts, they will also grant an additional 5 Single-channel guests." / Twitter
Understand guest roles in Slack | Slack
An introduction to sharing channels and guest accounts | Slack