Brian from Five Minute WatchKit here. This was so damn easy to deploy and it makes creating a public community on Slack a breeze. I'm glad Robleh posted it.
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 badge with inline invitation capabilities
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