Slack could probably kill twitter overnight by supporting proper public channels.
corporations, government departments, bloggers, city halls,... any obvious social/community hub can host a public slack
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
corporations, government departments, bloggers, city halls,... any obvious social/community hub can host a public slack