I found out about Slackin after joining the Apple Watch chat group Five Minute Watchkit. Check it out > http://slack.fiveminutewatchkit....
Slackin was made by @rauchg who wrote about it here. Here's what it let's you do:
1. Set up a landing page to invite users (with realtime updates of how many users are online and in the group)
2. Gives you an HTML…See more
